Adapt process-tests to Android

Adapt process-tests to Android

* src/android.c (android_init_thread_events)
(android_run_select_thread): Guarantee that the select thread is
initialized before returning.

* test/src/process-tests.el
(process-tests/fd-setsize-no-crash/make-process)
(process-tests/fd-setsize-no-crash/make-pipe-process)
(process-tests/fd-setsize-no-crash/make-network-process)
(process-tests/fd-setsize-no-crash/make-serial-process): Skip on
Android.

(cherry picked from commit 18c8c44bef9b85adf3cff65f08b7f6a8c59687db)