[gjs: 6/6] Merge branch 'pch' into 'master'

[Philip Chimento <pchimento src gnome org>]

commit 0244b5cb748e533a56042ea3c92ac76718bedc02
Merge: 6a62d1e8 1bcb9bea
Author: Philip Chimento <philip chimento gmail com>
Date:   Mon May 17 04:38:06 2021 +0000

    Merge branch 'pch' into 'master'
    
    build: Support building with precompiled headers
    
    See merge request GNOME/gjs!620

 .gitlab-ci.yml    |  39 +++++++++++-
 gjs/gjs_pch.hh    | 131 ++++++++++++++++++++++++++++++++++++++
 meson.build       |  14 +++-
 test/check-pch.sh | 187 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 367 insertions(+), 4 deletions(-)
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