[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/vorbis/all/test_package/test_package.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include <vorbis/vorbisenc.h>
+
+int main(){
+  vorbis_comment   vc;
+  vorbis_comment_init(&vc);
+}