[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/libsndfile/all/test_package/test_package.cpp

@@ -0,0 +1,17 @@
+#include "sndfile.hh"
+
+#if __cplusplus < 201100 && defined(_MSC_VER)
+#undef nullptr
+#endif
+
+#include <iostream>
+
+int main(int argc, char *argv[]) {
+	if (argc < 2) {
+		std::cout << "Usage: example <file.wav>\n";
+		return 0;
+	}
+    SndfileHandle handle(argv[1]);
+    std::cout << "Sample rate: " << handle.samplerate() << "\n";
+	return 0;
+}