Remove obsoleted android_(small|extra) build script

Bug: 1146288
Change-Id: Ib1a7b7d33127d7573444b7dae065c9f1f1ffb411
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/3582190
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
8 files changed