yasm: Respect portage host cc variable

Pass CC_FOR_BUILD and CCLD_FOR_BUILD to econf.
Otherwise it invokes cc instead of portage specified HOST/BUILD CC.

Gentoo PR: https://github.com/gentoo/gentoo/pull/16180

BUG=chromium:979916, chromium:991812, chromium:1093608
TEST=CQ

Change-Id: I4cad14fa11212b3a3cc4e3d66bf886cbe49651f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2238520
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
1 file changed