match.c: Add comment to clarify that endif corresponding to which ifndef

The endif preprocessor directive was corresponding to an ifndef _WIN32,
a comment has been added which clarifies that.

Signed-off-by: Eshan Kelkar <eshankelkar@galorithm.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Sahana Prasad <sahana@redhat.com>

src/match.c

@@ -576,7 +576,7 @@ match_cidr_address_list(const char *address,
 
     return rc;
 }
-#endif
+#endif /* _WIN32 */
 
 /**
  * @brief Tries to match an object against a comma separated group of objects