[glib: 2/2] Merge branch 'wip/g-warning-once' into 'master'

[Philip Withnall <pwithnall src gnome org>]

commit d770e00d9c8fd5cfc6406323970d70af4364da16
Merge: 35e26151a 15e3b6f13
Author: Philip Withnall <philip tecnocode co uk>
Date:   Wed Oct 9 15:09:53 2019 +0000

    Merge branch 'wip/g-warning-once' into 'master'
    
    gmessages: Add g_warning_once()
    
    See merge request GNOME/glib!1028

 docs/reference/glib/glib-sections.txt |  1 +
 glib/gmessages.h                      | 38 +++++++++++++++++++++++++++++++++++
 tests/testglib.c                      | 21 +++++++++++++++++++
 3 files changed, 60 insertions(+)
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