does not compile under gccgo

[rrh]

I installed gccgo (from gcc 5, on ubuntu). The crc32_amd64.s source file doesn't compile, since that's cgo specific asm language:
Godeps/_workspace/src/github.com/klauspost/crc32/crc32_amd64.s:9: Error: no such instruction: `text ·castagnoliSSE42(SB),NOSPLIT,$0'
....

There should be some kind of guard on the .s files (and/or the alternative pure go files) that detect when gccgo is in use and not compile the .s file(s).

[klauspost]

Thanks for the report.

Is it possible for you to test #12 ?

[rrh]

See my comment in #12
I'd fix it myself, but the overhead of forking, changing this PR, is too high
Thanks for your very rapid response!

[klauspost]

Cheers