[dbg] Load libav::strerror() from libavutil

Author: grandchild

avs/vis_avs/video_libav.cpp

@@ -25,6 +25,7 @@ bool AVS_Video::LibAV::load_libav_dlibs() {
     LOAD_FUNC(AVS_Video::LibAV, libavformat, av, read_frame);
     LOAD_FUNC(AVS_Video::LibAV, libavformat, av, seek_frame);
     LOAD_FUNC(AVS_Video::LibAV, libavutil, av, frame_unref);
+    LOAD_FUNC(AVS_Video::LibAV, libavutil, av, strerror);
     LOAD_FUNC(AVS_Video::LibAV, libavcodec, avcodec, find_decoder);
     LOAD_FUNC(AVS_Video::LibAV, libavcodec, avcodec, alloc_context3);
     LOAD_FUNC(AVS_Video::LibAV, libavcodec, avcodec, parameters_to_context);
@@ -55,6 +56,7 @@ DEFINE_FUNC(AVS_Video::LibAV, av, packet_unref);
 DEFINE_FUNC(AVS_Video::LibAV, av, read_frame);
 DEFINE_FUNC(AVS_Video::LibAV, av, seek_frame);
 DEFINE_FUNC(AVS_Video::LibAV, av, frame_unref);
+DEFINE_FUNC(AVS_Video::LibAV, av, strerror);
 DEFINE_FUNC(AVS_Video::LibAV, avcodec, find_decoder);
 DEFINE_FUNC(AVS_Video::LibAV, avcodec, alloc_context3);
 DEFINE_FUNC(AVS_Video::LibAV, avcodec, parameters_to_context);

avs/vis_avs/video_libav.h

@@ -53,6 +53,7 @@ struct AVS_Video::LibAV {
     static decltype(&av_read_frame) read_frame;
     static decltype(&av_seek_frame) seek_frame;
     static decltype(&av_frame_unref) frame_unref;
+    static decltype(&av_strerror) strerror;
     static decltype(&avcodec_find_decoder) find_decoder;
     static decltype(&avcodec_alloc_context3) alloc_context3;
     static decltype(&avcodec_parameters_to_context) parameters_to_context;