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/mbedtls/error.c

@@ -16,7 +16,6 @@
 │ limitations under the License.                                               │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "third_party/mbedtls/error.h"
-#include "libc/fmt/fmt.h"
 #include "libc/str/str.h"
 #include "third_party/mbedtls/aes.h"
 #include "third_party/mbedtls/asn1.h"

third_party/mbedtls/oid.c

@@ -15,7 +15,6 @@
 │ See the License for the specific language governing permissions and          │
 │ limitations under the License.                                               │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/fmt/fmt.h"
 #include "libc/str/str.h"
 #include "third_party/mbedtls/common.h"
 #include "third_party/mbedtls/error.h"

third_party/mbedtls/platform.h

@@ -2,7 +2,6 @@
 #define COSMOPOLITAN_THIRD_PARTY_MBEDTLS_PLATFORM_H_
 #include "libc/assert.h"
 #include "libc/calls/calls.h"
-#include "libc/fmt/fmt.h"
 #include "libc/intrin/likely.h"
 #include "libc/mem/mem.h"
 #include "libc/runtime/runtime.h"

third_party/mbedtls/test/lib.c

@@ -22,7 +22,6 @@
 #include "libc/dce.h"
 #include "libc/errno.h"
 #include "libc/fmt/conv.h"
-#include "libc/fmt/fmt.h"
 #include "libc/intrin/bits.h"
 #include "libc/intrin/describebacktrace.internal.h"
 #include "libc/intrin/safemacros.internal.h"

third_party/mbedtls/x509.c

@@ -15,7 +15,6 @@
 │ See the License for the specific language governing permissions and          │
 │ limitations under the License.                                               │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/fmt/fmt.h"
 #include "libc/mem/mem.h"
 #include "libc/stdio/stdio.h"
 #include "libc/time/struct/tm.h"

third_party/mbedtls/x509_crt.c

@@ -18,7 +18,6 @@
 #include "libc/calls/calls.h"
 #include "libc/calls/struct/dirent.h"
 #include "libc/calls/struct/stat.h"
-#include "libc/fmt/fmt.h"
 #include "libc/intrin/bits.h"
 #include "libc/limits.h"
 #include "libc/log/log.h"