Remove incorrect use of ctype.h functions.

As far as I can tell the code should not change behaviour
depending on locale in any of these places.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

libavformat/urldecode.c

@@ -26,7 +26,6 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include <ctype.h>
 #include <string.h>
 
 #include "libavutil/mem.h"
@@ -54,7 +53,7 @@ char *ff_urldecode(const char *url)
         if (c == '%' && s + 2 < url_len) {
             char c2 = url[s++];
             char c3 = url[s++];
-            if (isxdigit(c2) && isxdigit(c3)) {
+            if (av_isxdigit(c2) && av_isxdigit(c3)) {
                 c2 = av_tolower(c2);
                 c3 = av_tolower(c3);