glibc: roll to 2.23

This rolls glibc to 2.23.

Differences from upstream:
five local patches.
appended-cflags "-ggdb" and export SYSROOT="" in setup_target_flags()
use abort() directly instead of INLINE_SYSCALL(kill, 2, pid, SIGABRT);
configure whith --with-bugurl=http://crbug.com/new

BUG=chromium:603189
TEST=cbuildbot daisy-release falco-release x86-alex-release oak-release

Change-Id: Ic2062b0a6df14f68f802177e5d8ab090d13490cf
Reviewed-on: https://chromium-review.googlesource.com/339261
Commit-Ready: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
35 files changed