[gjs] (3 commits) Non-fast-forward update to branch wip/ptomato/mozjs31

[Philip Chimento <pchimento src gnome org>]

The branch 'wip/ptomato/mozjs31' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  0b11eab... WIP - JS_Init() and JS_ShutDown()
  dc3cb7d... WIP - Destroy runtime

Commits added to the branch:

  b17917f... js: Don't exit immediately from System.exit()
  3146cc1... js: Call JS_Init() and JS_ShutDown()
  d8d3831... WIP - Destroy runtime