The android-cts-runner.sh and android-deqp-runner.sh scripts are usually
sourced from android-runner.sh which then propagates the EXIT_CODE value
set in the scripts.
However this scheme does not cover the case where android-cts-runner.sh
and android-deqp-runner.sh are called directly, in that case they will
not return the previously saved EXIT_CODE appropriately in the last
command.
Fix that, allowing developers to call the scripts directly with the
intended behavior.
After this change android-runner.sh does not need to know about the
EXIT_CODE variable anymore, which was a slight layering violation, but
it can just rely on the exit code of the last executed commands.
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36286>
8f2715c333