Bug 570340: don't use amd64 assembly code on mingw-w64 because it's not yet mingw-w64 compatible.  The patch is contributed by Jacek Caban <jacek@codeweavers.com>.  r=wtc.
Bug 570340: don't use amd64 assembly code on mingw-w64 because it's not yet
mingw-w64 compatible.  The patch is contributed by Jacek Caban
<jacek@codeweavers.com>.  r=wtc.

nmav/nss,nmav/nss,nmav/nss,nmav/nss,nmav/nss,ekr/nss-old,nmav/nss,ekr/nss-old,ekr/nss-old,ekr/nss-old,nmav/nss,ekr/nss-old,ekr/nss-old,ekr/nss-old