[gimp] autotools, meson: bump GEGL dependency to 0.4.27.

[Jehan <jehanp src gnome org>]

commit 5de6b2c1ea9248f2a1c5f5dd7715f3ed5943c8cb
Author: Jehan <jehan girinstud io>
Date:   Sat Sep 12 15:54:13 2020 +0200

    autotools, meson: bump GEGL dependency to 0.4.27.
    
    Current dev code of GEGL is necessary as it fixes its VAPI dependency
    (see gegl!83). Without this, with a recent meson version, Vala plug-in
    build fails.
    
    See !334 for some more background.

 configure.ac | 2 +-
 meson.build  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 85637f172b..ca5032da21 100644
--- a/configure.ac
+++ b/configure.ac
@@ -60,7 +60,7 @@ m4_define([fontconfig_required_version], [2.12.4])
 m4_define([freetype2_required_version], [2.1.7])
 m4_define([gdk_pixbuf_required_version], [2.30.8])
 m4_define([gegl_major_minor_version], [0.4])
-m4_define([gegl_micro_version], [26])
+m4_define([gegl_micro_version], [27])
 m4_define([gegl_required_version],
           [gegl_major_minor_version.gegl_micro_version])
 m4_define([gexiv2_required_version], [0.10.6])
diff --git a/meson.build b/meson.build
index a4958d2ec3..c533a09de8 100644
--- a/meson.build
+++ b/meson.build
@@ -352,7 +352,7 @@ freetype2_minver  = '2.1.7'
 freetype2         = dependency('freetype2',          version: '>='+freetype2_minver)
 gdk_pixbuf_minver = '2.30.8'
 gdk_pixbuf        = dependency('gdk-pixbuf-2.0',     version: '>='+gdk_pixbuf_minver)
-gegl_minver       = '0.4.26'
+gegl_minver       = '0.4.27'
 gegl              = dependency('gegl-0.4',           version: '>='+gegl_minver)
 gexiv2_minver     = '0.10.6'
 gexiv2            = dependency('gexiv2',             version: '>='+gexiv2_minver)