add crc32c
add crc32c

fimad/stackage,simonmichael/stackage,asr/stackage,Daniel-Diaz/stackage,mrkkrp/stackage,stackbuilders/stackage,int-index/stackage,iand675/stackage,peti/stackage,ethercrow/stackage,athanclark/stackage,jonschoning/stackage,fpco/stackage,spencerjanssen/stackage,michalkonecny/stackage,mstksg/stackage,soenkehahn/stackage,wereHamster/stackage,clinty/stackage,massysett/stackage