ffplay compilation broken when disable avfilter

[Ching Yi, Chan]

I check the n0.8.2 tag and compile it with the configuration:

./configure --disable-doc \
--disable-ffserver --disable-muxers --disable-avdevice \
--disable-postproc --disable-avfilter --disable-bsfs \
--disable-filters --disable-devices \
--disable-encoders --disable-asm \
--disable-bzlib \
--disable-zlib \
--prefix=/opt/ffmpeg

I got the trouble:

qty:ffmpeg_icy qrtt1$ make
CC      ffplay.o
ffplay.c: In function ‘queue_picture’:
ffplay.c:1411: warning: passing argument 2 of ‘sws_scale’ from incompatible pointer type
ffplay.c: In function ‘video_thread’:
ffplay.c:1782: error: ‘picref’ undeclared (first use in this function)
ffplay.c:1782: error: (Each undeclared identifier is reported only once
ffplay.c:1782: error: for each function it appears in.)
ffplay.c: In function ‘SDL_main’:
ffplay.c:3044: warning: assignment discards qualifiers from pointer target type
make: *** [ffplay.o] Error 1

The variable picref should only use when enable avfilters.

[Carl Eugen Hoyos]

This should be fixed in git master and all future releases.