media-libs/libmikmod: remove unused patch(es)

Signed-off-by: Michael Mair-Keimberger <mm1ke@gentoo.org>

media-libs/libmikmod/files/libmikmod-3.3.11.1-macro-strict-prototypes.patch

@@ -1,14 +0,0 @@
-Already fixed upstream in https://github.com/sezero/mikmod/commit/4ceeed3f3929b9d9f7cfe891d44f43d202b64416.
-
-Fixes -Wstrict-prototypes.
---- a/libmikmod.m4
-+++ b/libmikmod.m4
-@@ -79,7 +79,7 @@ char* my_strdup (char *str)
-   return new_str;
- }
- 
--int main()
-+int main(void)
- {
-   int major,minor,micro;
-   int libmikmod_major_version,libmikmod_minor_version,libmikmod_micro_version;