通过添加 -lavutil 修正编译错误

错误如下

/usr/bin/ld: ../libav/libav.a(avplay.c.o): undefined reference to symbol
'av_get_default_channel_layout@@LIBAVUTIL_52'
/usr/bin/ld: note: 'av_get_default_channel_layout@@LIBAVUTIL_52' is
defined
in DSO /usr/local/lib/libavutil.so.52 so try adding it to the linker
command line
/usr/local/lib/libavutil.so.52: could not read symbols: Invalid
operation
collect2: ld 返回 1