avfilter/showwaves: use INT16_MAX instead of a self defined macro
avfilter/showwaves: fix height range for cline mode
lavfi: port mp=fspp to a native libavfilter filter

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
lavfi/mp: drop mp=fspp filter

It has been ported to libavfilter.
avfilter/vf_fspp: add missing inline asm guards
avcodec/vc1_mc: use the same reference as luma does in ff_vc1_mc_4mv_chroma()

Fixes Ticket3230

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>