Add -mstackrealign -mpreferred-stack-boundary=4 to CFLAGS on i386 for all
gcc 4.x versions, this appears to still be needed with gcc 4.8.4.
Bump PKGREVISION for ffmpeg1 and ffplay1 (which uses ffmpeg1 patches)
FFplay is a very simple and portable media player using the FFmpeg
libraries and the SDL library. It is mostly used as a testbed for
the various FFmpeg APIs.