bzero() should be defined without special defines

Author: jart

libc/str/str.h

@@ -173,16 +173,11 @@ char *__join_paths(char *, size_t, const char *, const char *) libcesque __wur;
 int __mkntpathat(int, const char *, int, char16_t[hasatleast 1024]);
 #endif /* _COSMO_SOURCE */
 
-#if defined(_COSMO_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE) || \
-    defined(_POSIX_SOURCE) ||                                                 \
-    (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE + 0 < 200809L) ||            \
-    (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE + 0 < 700)
 int bcmp(const void *, const void *, size_t) strlenesque;
 void bcopy(const void *, void *, size_t) memcpyesque;
 void bzero(void *, size_t) memcpyesque;
 char *index(const char *, int) strlenesque;
 char *rindex(const char *, int) strlenesque;
-#endif
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */