[gjs] Created tag 1.58.4

[Philip Chimento <pchimento src gnome org>]

The unsigned tag '1.58.4' was created.

Tagger: Philip Chimento <philip chimento gmail com>
Date: 1578445431 -0500

    Version 1.58.4
    
    - Now prints a warning when constructing an unregistered object inheriting from
      GObject (i.e. if you forgot to use GObject.registerClass.) In 1.58.2 this
      would throw an exception, which broke some existing code, so that change was
      reverted in 1.58.3. In this version the check is reinstated, but we log a
      warning instead of throwing an exception, so that people know to fix their
      code, but without breaking things.
      NOTE: In 1.64 (the next stable release) the warning will be changed back into
      an exception, because code with this problem can be subtly broken and cause
      unexpected errors elsewhere. So make sure to fix your code if you get this
      warning.
    
    - Closed bugs and merge requests:
      * GSettings crash fixes [Andy Holmes, !373]
    
    - Memory savings for Cairo objects [Philip Chimento, !374]
    
    - Fix for crash in debug functions [Philip Chimento, !374]

Changes since the last tag '1.58.3':

Andy Holmes (2):
      Gio override: optimize constructor param checks in _init
      Gio override: check for missing or conflicting schema path

Philip Chimento (5):
      build: Post-release version bump
      object: Warn if constructing an unregistered object inheriting from GObject
      cairo: Remove unused fields from private structures
      jsapi-util-string: Make debug print functions handle null
      release: Prepare for 1.58.4