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)

tool/build/cp.c

@@ -20,7 +20,6 @@
 #include "libc/calls/struct/stat.h"
 #include "libc/errno.h"
 #include "libc/fmt/conv.h"
-#include "libc/fmt/fmt.h"
 #include "libc/fmt/libgen.h"
 #include "libc/fmt/magnumstrs.internal.h"
 #include "libc/limits.h"

tool/build/killall.c

@@ -176,7 +176,7 @@ int main(int argc, char *argv[]) {
     // get pids of all processes on system
     uint32_t n;
     if (!EnumProcesses(pids, sizeof(pids), &n)) {
-      fprintf(stderr, "%s: EnumProcesses() failed: %s\n", prog,
+      fprintf(stderr, "%s: EnumProcesses() failed: %hs\n", prog,
               DescribeError(GetLastError()));
       exit(1);
     }

tool/build/mv.c

@@ -20,7 +20,6 @@
 #include "libc/calls/struct/stat.h"
 #include "libc/errno.h"
 #include "libc/fmt/conv.h"
-#include "libc/fmt/fmt.h"
 #include "libc/fmt/libgen.h"
 #include "libc/fmt/magnumstrs.internal.h"
 #include "libc/limits.h"

tool/build/pledge.c

@@ -73,7 +73,6 @@
 //     test/tool/build/pledge_test.sh
 //
 
-__static_yoink("strerror_wr");
 __static_yoink("zipos");
 
 #define USAGE \