slicing-by-8 algorithm for crc32 and crc32c

Signed-off-by: Amperific <amperific@gmail.com>

Conflicts:
	lib/crc32.c
	lib/crc32defs.h
	lib/gen_crc32table.c
Revert "slicing-by-8 algorithm for crc32 and crc32c"

This reverts commit a79c0cbf7f40abf42a90937b827d3c890c1cddd6.

Signed-off-by: Amperific <amperific@gmail.com>

Conflicts:
	lib/crc32.c
	lib/crc32defs.h
	lib/gen_crc32table.c