function get_localtime should not be extern

Author: zimirza

libc/src/time/linux/localtime_utils.h

@@ -19,7 +19,7 @@ LIBC_INLINE volatile int file_usage;
 namespace LIBC_NAMESPACE_DECL {
 namespace localtime_utils {
 
-extern timezone::tzset *get_localtime(struct tm *tm);
+timezone::tzset *get_localtime(struct tm *tm);
 
 } // namespace localtime_utils
 } // namespace LIBC_NAMESPACE_DECL