Avoid deprecated av_register_all with version check.

rpcs3/Emu/Cell/Modules/cellAdec.cpp

@@ -315,8 +315,8 @@ public:
 		, cbFunc(func)
 		, cbArg(arg)
 	{
-		av_register_all();
+		//av_register_all();
-		avcodec_register_all();
+		//avcodec_register_all();
 
 		switch (type)
 		{

rpcs3/Emu/Cell/Modules/cellVdec.cpp

@@ -132,7 +132,18 @@ struct vdec_context final
 		, cb_func(func)
 		, cb_arg(arg)
 	{
+#ifdef _MSC_VER
+#pragma warning(push, 0)
+#else
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
 		avcodec_register_all();
+#ifdef _MSC_VER
+#pragma warning(pop)
+#else
+#pragma GCC diagnostic pop
+#endif
 
 		switch (type)
 		{