K 10
svn:author
V 6
brooks
K 8
svn:date
V 27
2019-08-09T23:50:57.196880Z
K 7
svn:log
V 304
Don't add -Wno-class-memaccess with older gcc.

This is a gcc 8.0+ warning which needed to be silenced on for the riscv
build.  amd64-xtoolchain-gcc still uses gcc 6.4.0 and does not understand
this flag.

Reviewed by:	asomers
Feedback from:	imp
Differential Revision:	https://reviews.freebsd.org/D21195

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