ci/android: trust system GLES if ANGLE_TAG is not specified

In commit c99c67c4908 (ci/android: Only replace ANGLE if needed,
2025-06-05) ANGLE is replaced in the Android device only when ANGLE_TAG
is specified.

However it can still happen that the device was using ANGLE all along,
and not replacing it means that the original version would not match the
one built by mesa-ci, making the GLES version check fail unnecessarily.

In case ANGLE_TAG is not specified the GLES version check can be skipped
altogether, the rationale for this approach is that ANGLE can be
considered the  default GLES implementation for Android going forward,
so if android-runner.sh has not replaced it we can just trust that the
original one is in place.

There might still be some fancy setups in the wild where the GLES
implementation is mesa and not ANGLE, but we are not testing those in
mesa-ci for now, so skipping the test for non-ANGLE GLES too is
acceptable.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35380>
1 file changed