Revert "glibc: roll to 2.23"

New glibc causes segmentation fault on fc-cache. We need
to revert this first.

This reverts commit 88ad3013d1add4b162d277fbacf9b491fc00ad4e.

BUG=676013
TEST=sudo emerge chromeos-fonts passes with old glibc.

Change-Id: I932e3ccc4ab71da756c4d47aff1a6fa4e4acf490
Reviewed-on: https://chromium-review.googlesource.com/422417
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Commit-Queue: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
35 files changed