New review comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/41768#discussion_r1083327715

Comment:
```suggestion
if [ "$XBPS_TARGET_LIBC" = "musl" ]; then
	make_build_args+=" MALLOC=libc"
else
	makedepends+=" jemalloc-devel"
	make_build_args+=" MALLOC=jemalloc"
fi
```