[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/test_package/test_package.c

@@ -0,0 +1,32 @@
+#include "x265.h"
+
+#include <stdlib.h>
+
+#ifdef WITH_LIB
+# ifdef _WIN32
+#  define TEST_IMPORT __declspec(dllimport)
+# else
+#  define TEST_IMPORT
+# endif
+
+TEST_IMPORT const char *test_library_version(void);
+TEST_IMPORT void test_library_something(void);
+#endif
+
+int main()
+{
+    x265_param * param = x265_param_alloc();
+    x265_param_default(param);
+    param->sourceWidth = 640;
+    param->sourceHeight = 480;
+    param->fpsNum = 25;
+    param->fpsDenom = 1;
+    x265_encoder * encoder = x265_encoder_open(param);
+    x265_encoder_close(encoder);
+    x265_param_free(param);
+#ifdef WITH_LIB
+    test_library_version();
+    test_library_something();
+#endif
+    return EXIT_SUCCESS;
+}