[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/libwebp/all/test_package/test_package.c

@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <webp/decode.h>
+
+int main(void)
+{
+    int version = WebPGetDecoderVersion();
+    printf("Webp Decoder version: %d\n", version);
+
+    return 0;
+}