avcodec/x86/mathops: clip constants used with shift instructions within inline assembly
Fixes assembling with binutils as
2.41 and newer:
libavcodec/x86/mathops.h:125: Error: operand type mismatch for `shr'
Backports https://git.ffmpeg.org/gitweb/ffmpeg.git/patch/effadce6c756247ea8bae32dc13bb3e6f464f0eb fixing build on Debian 11.
Edited by amyspark