Log Message:
Add patch from PR pkg/48680, fixing build on netbsd-7/i386 and newer.
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 ffmpeg2 and ffplay2 (which uses ffmpeg2 patches)