Clean up some code

- Use good ELF technique in cosmo_dlopen()
- Make strerror() conform more to other libc impls
- Introduce __clear_cache() and use it in cosmo_dlopen()
- Remove libc/fmt/fmt.h header (trying to kill off LIBC_FMT)

third_party/zstd/lib/common/xxhash.h

@@ -437,7 +437,6 @@ XXH_PUBLIC_API XXH32_hash_t XXH32 (const void* input, size_t length, XXH32_hash_
  * @code{.c}
  *    #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/lib/common/zstd_deps.h

@@ -115,7 +115,6 @@
 
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/lib/compress/zstdmt_compress.c

@@ -43,7 +43,6 @@
 
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/lib/dictBuilder/cover.c

@@ -24,7 +24,6 @@
 ***************************************/
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/lib/dictBuilder/cover.h

@@ -15,7 +15,6 @@
 
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/lib/dictBuilder/divsufsort.c

@@ -40,7 +40,6 @@
 #include "libc/assert.h"
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/lib/dictBuilder/fastcover.c

@@ -14,7 +14,6 @@
 ***************************************/
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/lib/dictBuilder/zdict.c

@@ -57,7 +57,6 @@
 #include "libc/str/str.h"        /* memset */
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/programs/benchfn.c

@@ -55,7 +55,6 @@
 #if defined(DEBUG) && (DEBUG >= 1)
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/programs/benchzstd.c

@@ -43,7 +43,6 @@
 #include "libc/str/str.h"      /* memset, strerror */
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/programs/datagen.c

@@ -33,7 +33,6 @@
 #include "third_party/musl/rand48.h"    /* malloc, free */
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/programs/dibio.c

@@ -45,7 +45,6 @@
 #include "libc/str/str.h"         /* memset */
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/programs/fileio.c

@@ -28,7 +28,6 @@
 #include "third_party/zstd/programs/util.h"       /* UTIL_getFileSize, UTIL_isRegularFile, UTIL_isSameFile */
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/programs/fileio_asyncio.c

@@ -12,7 +12,6 @@
 #include "third_party/zstd/programs/platform.h"
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/programs/platform.h

@@ -186,7 +186,6 @@ extern "C" {
 #include "third_party/musl/lockf.h"   /* isatty */
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"
@@ -218,7 +217,6 @@ extern "C" {
 #include "libc/nt/winsock.h" /* DeviceIoControl, HANDLE, FSCTL_SET_SPARSE */
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/programs/timefn.c

@@ -66,7 +66,6 @@
 #include "third_party/musl/rand48.h"   /* abort */
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"
@@ -131,7 +130,6 @@ UTIL_time_t UTIL_getTime(void)
 #include "third_party/musl/rand48.h"   /* abort */
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"
@@ -179,7 +177,6 @@ UTIL_time_t UTIL_getTime(void)
 #include "third_party/musl/rand48.h"   /* abort */
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/programs/util.c

@@ -35,7 +35,6 @@ extern "C" {
 #include "third_party/musl/rand48.h"     /* malloc, realloc, free */
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/programs/zstdcli.c

@@ -50,7 +50,6 @@
 #include "libc/str/str.h"   /* strcmp, strlen */
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"

third_party/zstd/programs/zstdcli_trace.c

@@ -14,7 +14,6 @@
 #include "libc/calls/calls.h"
 #include "libc/assert.h"
 #include "libc/calls/weirdtypes.h"
-#include "libc/fmt/fmt.h"
 #include "libc/stdio/dprintf.h"
 #include "libc/stdio/stdio.h"
 #include "libc/temp.h"