desktop-file-utils: get rid of obsolete patches.

srcpkgs/desktop-file-utils/patches/add-font-valid-type.patch

@@ -1,16 +0,0 @@
-diff --git a/src/mimeutils.c b/src/mimeutils.c
-index 0833fdb..bddc7a0 100644
---- src/mimeutils.c
-+++ src/mimeutils.c
-@@ -52,9 +52,9 @@ static const char *known_old_fdo_media_types[] = {
-   "x-directory"
- };
- 
--/* Defined in RFC 2045/2046 and RFC 2077 */
-+/* Defined in RFC 2045/2046, RFC 2077 and RFC 8081 */
- static const char *registered_discrete_media_types[] = {
--  "application", "audio", "image", "model", "text", "video"
-+  "application", "audio", "font", "image", "model", "text", "video"
- };
- 
- /* Defined in RFC 2045/2046 */