decoder/ffmpeg: wrap FFmpeg include in "extern C"

Commit ebae25d1 added that #include, but forgot to wrap it in "extern C", so the linker tried to look up C++ symbols, causing linker failure. Closes https://github.com/MusicPlayerDaemon/MPD/issues/1582

decoder/ffmpeg: wrap FFmpeg include in "extern C"
59792cb0 · Max Kellermann · cc557c4d · 59792cb0 · 59792cb0
Commit 59792cb0 authored Jul 27, 2022 by Max Kellermann
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NEWS NEWS +2 -0

FfmpegIo.cxx src/decoder/plugins/FfmpegIo.cxx +4 -1

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--- a/NEWS
+++ b/NEWS
 ver 0.23.9 (not yet released)
+* decoder
+  - ffmpeg: support FFmpeg 5.1
 * output
  - pipewire: set app icon
 * improve iconv detection

--- a/src/decoder/plugins/FfmpegIo.cxx
+++ b/src/decoder/plugins/FfmpegIo.cxx
@@ -21,10 +21,13 @@
 #define __STDC_CONSTANT_MACROS

 #include "FfmpegIo.hxx"
-#include "libavutil/mem.h"
 #include "../DecoderAPI.hxx"
 #include "input/InputStream.hxx"

+extern "C" {
+#include <libavutil/mem.h>
+}
+
 AvioStream::~AvioStream()
 {
 	if (io != nullptr) {