avformat/gopher: Add audio and video itemtypes

The 's', ';', and '<' itemtypes are used for audio and video by
Gophernicus and Gopher+.

Signed-off-by: Christian Lee Seibold <christian.seibold32@outlook.com>
Signed-off-by: Marton Balint <cus@passwd.hu>

libavformat/gopher.c

@@ -48,8 +48,11 @@ static int gopher_connect(URLContext *h, const char *path)
 
     if (!*path) return AVERROR(EINVAL);
     switch (*++path) {
+        case ';':
+        case '<':
         case '5':
         case '9':
+        case 's':
             path = strchr(path, '/');
             if (!path) return AVERROR(EINVAL);
             break;