[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/libaom-av1/all/test_package/test_package.c

@@ -0,0 +1,7 @@
+#include "aom/aom_codec.h"
+#include <stdio.h>
+
+int main() {
+    printf("Version: %s\n", aom_codec_version_str());
+    return 0;
+}