Add std_detect for FreeBSD armv6, armv7 and powerpc64#747

Merged

gnzlbg merged 1 commit intorust-lang:masterfrom

MikaelUrankar:bsd-fix

May 9, 2019

Commits on Apr 26, 2019

Add std_detect for FreeBSD armv6, armv7 and powerpc64
miki
committed