Both Qualcomm and SwS require forceOldRewriteStructSamplers to be
enabled, so this change will enable that feature for all of Android.

We aren't sure yet why this is required for SwS also, but that will be
chased as part of issue 2703.

Bug: angleproject:4045
Change-Id: I83b2ac18e0111ed35438ffd457bfe120911a7767
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1879711
Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>