Don't run v14 check script on Android SDK.

AAPT 21+ is able to handle seperating XMLs.

BUG=487391

Change-Id: I28422fd0a203c18f0e4ecea92801bc5b32e735a5
Reviewed-on: https://chromium-review.googlesource.com/270761
Reviewed-by: Aurimas Liutikas <aurimas@chromium.org>
Commit-Queue: Aurimas Liutikas <aurimas@chromium.org>
Tested-by: Aurimas Liutikas <aurimas@chromium.org>
Tested-by: Kibeom Kim <kkimlabs@chromium.org>