[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/libx264/all/test_package/test_package.c

@@ -0,0 +1,16 @@
+#include <stdint.h>
+#include "x264.h"
+
+#include <stdlib.h>
+
+int main()
+{
+    x264_param_t preset;
+    x264_t *encoder;
+    x264_param_default_preset(&preset, "ultrafast", "zerolatency");
+    preset.i_width = 640;
+    preset.i_height = 480;
+    encoder = x264_encoder_open(&preset);
+    x264_encoder_close(encoder);
+    return EXIT_SUCCESS;
+}