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

(cherry picked from commit 4a045a66fd912b0e28a0585dbd8991643ccc2cb0)