Reland x86 toolchain from NDK r10e.

Starting with NDK r10d, -mstackrealign was disabled by default on x86. This
caused crashed on x86 devices running JellyBean. This relands the more recent
recent toolchain now that -mstackrealign is explicitely set in Chromium for
Android x86.
This reverts commit 334ba2c28be73ed0d6f4fa6e6c55e91c97b931f1.

Change-Id: I77e483c7958530416e1f190c413b8be64c4e82ae
Reviewed-on: https://chromium-review.googlesource.com/294050
Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Tested-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>