dct: remove SSE41 dct 8x8, 16x16 and 32x32 intrinsic primitives

These were adapted from vector class functions but were much slower than the
hand-tuned dct SSSE3 functions written by Min.
test: revert accidental change to 64 dims so testbench passes
cli: add missing --cpuid handler
ipfilter: gcc preprocessor does not allow ## use for non-symbols

The ## in this case was totally unnecessary
pixel: disable intrinsic cvt32to16_shr; it is causing hash mismatches