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libav: use LIBAV_CPPFLAGS for -I include paths
Autotools automatically appends user CPPFLAGS after target CPPFLAGS. Also, it puts all CPPFLAGS before CFLAGS in final generated gcc compile command. The internal ffmpeg include paths need to come before any other external include paths to ensure we don't accidentally pickup external ffmpeg headers first (i.e. from user CPPFLAGS include paths). Thus, move the internal LIBAV include paths to LIBAV_CPPFLAGS so that they come before any user defined CPPFLAGS. This allows ffmpeg and gst-ffmpeg to coexist on users system. https://bugzilla.gnome.org/show_bug.cgi?id=789379
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