remove additional libc struct accessor cruft

commit f9cccfc1 left behind the part
in libc.c; remove it too.

src/internal/libc.c

 #include "libc.h"
 
-#ifdef USE_LIBC_ACCESSOR
-struct __libc *__libc_loc()
-{
-	static struct __libc __libc;
-	return &__libc;
-}
-#else
 struct __libc __libc;
-#endif
-
-#ifdef BROKEN_VISIBILITY
-__asm__(".hidden __libc");
-#endif
 
 size_t __hwcap;
 size_t __sysinfo;