[DO-971] ffmpeg recipe with requirements (!9)

Co-authored-by: aleksandr.vodyanov <aleksandr.vodyanov@avroid.tech>
Reviewed-on: https://git.avroid.tech/Conan/conan_build/pulls/9

recipes/libx265/all/patches/3.2.1-0001-remove_register_classifier.patch

@@ -0,0 +1,13 @@
+diff --git a/source/common/md5.cpp b/source/common/md5.cpp
+index 285b44a..c4964e7 100644
+--- a/source/common/md5.cpp
++++ b/source/common/md5.cpp
+@@ -185,7 +185,7 @@ void MD5Final(MD5Context *ctx, uint8_t *digest)
+  */
+ void MD5Transform(uint32_t *buf, uint32_t *in)
+ {
+-    register uint32_t a, b, c, d;
++    uint32_t a, b, c, d;
+ 
+     a = buf[0];
+     b = buf[1];