port: also try GL4.1 core; a little bit of cleanup

include/PR/os_libc.h

@@ -90,9 +90,7 @@ extern "C" {
 
 #ifndef PLATFORM_OSX
 extern void     bcopy(const void *, void *, size_t);
-#endif
 extern int      bcmp(const void *, const void *, size_t);
-#ifndef PLATFORM_OSX
 extern void     bzero(void *, size_t);
 #endif