stabilize for all non-prefix arches

This stabilizes things for all the non-prefix/unsupported arches.
It shouldn't impact the arches we care about (amd64/arm/x86).

Now that cros_portage_upgrade does the same thing for us, we can
mung all the existing ebuilds.

Generated by running:
find -type f -name '*.ebuild' -exec sed -i -r \
	'/^[[:space:]]*KEYWORDS/s:~(alpha|hppa|ia64|m68k|mips|ppc|ppc64|s390|sh|sparc)([ "]):\1\2:g' {} +

BUG=chromium:307180
TEST=`cbuildbot chromiumos-sdk {arm,x86,amd64}-generic-full` work

Change-Id: I6d66b7a22f21428db32dc50216c50fc023023d7f
Reviewed-on: https://chromium-review.googlesource.com/173029
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Matt Tennant <mtennant@chromium.org>
477 files changed