libc: remove bcmp

This symbol is already provided by compiler_rt

lib/libc/musl/src/string/bcmp.c

@@ -1,8 +0,0 @@
-#define _BSD_SOURCE
-#include <string.h>
-#include <strings.h>
-
-int bcmp(const void *s1, const void *s2, size_t n)
-{
-	return memcmp(s1, s2, n);
-}

src/libs/musl.zig

@@ -1751,7 +1751,6 @@ const src_files = [_][]const u8{
     "musl/src/stdlib/strtol.c",
     "musl/src/stdlib/wcstod.c",
     "musl/src/stdlib/wcstol.c",
-    "musl/src/string/bcmp.c",
     "musl/src/string/bcopy.c",
     "musl/src/string/explicit_bzero.c",
     "musl/src/string/index.c",

src/libs/wasi_libc.zig

@@ -1031,7 +1031,6 @@ const libc_top_half_src_files = [_][]const u8{
     "musl/src/stdlib/qsort.c",
     "musl/src/stdlib/qsort_nr.c",
     "musl/src/stdlib/strtol.c",
-    "musl/src/string/bcmp.c",
     "musl/src/string/bcopy.c",
     "musl/src/string/explicit_bzero.c",
     "musl/src/string/index.c",