By disabling apk generation, we can build all of our targets in a
standalone ANGLE checkout on Linux.

This allows tools like gn desc to give us useful information about
Android builds.

BUG=angleproject:4026,angleproject:2344

Change-Id: Ic46348fd06c5174ce5e5a4d89ceb391246c6ac6b
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1866080Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>