[gimp] meson: add json-glib as dependency in meson files too.

[Jehan <jehanp src gnome org>]

commit f89692c25fcfcd46a9f77c1e7b309750a9688679
Author: Jehan <jehan girinstud io>
Date:   Mon Dec 9 03:00:57 2019 +0100

    meson: add json-glib as dependency in meson files too.
    
    Done on a separate commit to make cherry-picking easily to gimp-2-10
    without all the meson changes.

 app/meson.build | 1 +
 meson.build     | 1 +
 2 files changed, 2 insertions(+)
---
diff --git a/app/meson.build b/app/meson.build
index c452e49035..68a32ed2c6 100644
--- a/app/meson.build
+++ b/app/meson.build
@@ -52,6 +52,7 @@ libapp_sources = [
   'errors.c',
   'gimp-debug.c',
   'gimp-log.c',
+  'gimp-update.c',
   'gimp-version.c',
   'language.c',
   'sanity.c',
diff --git a/meson.build b/meson.build
index 2692ea2d44..d45970e03d 100644
--- a/meson.build
+++ b/meson.build
@@ -353,6 +353,7 @@ gtk3_minver       = '3.16.10'
 gtk3              = dependency('gtk+-3.0',           version: '>='+gtk3_minver)
 harfbuzz_minver   = '0.9.19'
 harfbuzz          = dependency('harfbuzz',           version: '>='+harfbuzz_minver)
+json_glib         = dependency('json-glib-1.0',      version: '>=1.2.6')
 lcms_minver       = '2.8'
 lcms              = dependency('lcms2',              version: '>='+lcms_minver)
 libmypaint_minver = '1.3.0'