[gimp] bump required GEGL version to 0.3.20

[Øyvind Kolås <ok src gnome org>]

commit 4410ab0db080e53bb4e81b8a49e598ece1d0a5f6
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Aug 15 22:43:04 2017 +0200

    bump required GEGL version to 0.3.20

 app/sanity.c |    2 +-
 configure.ac |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/app/sanity.c b/app/sanity.c
index 2108974..4df51b9 100644
--- a/app/sanity.c
+++ b/app/sanity.c
@@ -518,7 +518,7 @@ sanity_check_gegl (void)
 
 #define GEGL_REQUIRED_MAJOR 0
 #define GEGL_REQUIRED_MINOR 3
-#define GEGL_REQUIRED_MICRO 18
+#define GEGL_REQUIRED_MICRO 20
 
   gegl_get_version (&gegl_major_version,
                     &gegl_minor_version,
diff --git a/configure.ac b/configure.ac
index d478d1a..5e34d91 100644
--- a/configure.ac
+++ b/configure.ac
@@ -44,7 +44,7 @@ m4_define([gimp_full_name], [GNU Image Manipulation Program])
 
 # required versions of other packages
 m4_define([babl_required_version], [0.1.30])
-m4_define([gegl_required_version], [0.3.18])
+m4_define([gegl_required_version], [0.3.20])
 m4_define([glib_required_version], [2.40.0])
 m4_define([atk_required_version], [2.2.0])
 m4_define([gtk_required_version], [2.24.10])