Migrate usage of GPM_CLICK_EVENT to MOUSE_CLICK_EVENT.

* src/termhooks.h (enum event_kind):
* src/term.c (term_mouse_click, handle_one_term_event):
* src/keyboard.c (discard_mouse_events, make_lispy_event): Migrate
usage of GPM_CLICK_EVENT to MOUSE_CLICK_EVENT.
1 job for master in 110 minutes and 25 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #8923
test-all

01:50:25