Apply suggestions from code review

Author: ldionne

libcxx/include/__locale_dir/support/linux.h

@@ -98,6 +98,7 @@ inline _LIBCPP_HIDE_FROM_ABI long long __strtoll(const char* __nptr, char** __en
 #if !defined(_LIBCPP_HAS_MUSL_LIBC)
   return ::strtoll_l(__nptr, __endptr, __base, __loc);
 #else
+  (void)__loc;
   return ::strtoll(__nptr, __endptr, __base);
 #endif
 }
@@ -107,6 +108,7 @@ __strtoull(const char* __nptr, char** __endptr, int __base, __locale_t __loc) {
 #if !defined(_LIBCPP_HAS_MUSL_LIBC)
   return ::strtoull_l(__nptr, __endptr, __base, __loc);
 #else
+  (void)__loc;
   return ::strtoull(__nptr, __endptr, __base);
 #endif
 }