We can use output_name instead of repeating the libs suffix in the GN
files.

The re-land adds automatic suffix application on Android. This makes
the configuration a bit simpler and should detect future breakage. Also
cleans up some of the "angle_libraries" code.

Bug: angleproject:3611
Change-Id: I4971d1085ca67802c916655c30efb7df4001f040
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1679993Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>