[gimp] configure/app: depend on babl 0.1.56

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 3d464e03b46af8431c252ba7216471fc2e7df8e0
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Aug 14 18:47:29 2018 +0200

    configure/app: depend on babl 0.1.56

 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 78eb3ee8a6..04c19b18ca 100644
--- a/app/sanity.c
+++ b/app/sanity.c
@@ -480,7 +480,7 @@ sanity_check_babl (void)
 
 #define BABL_REQUIRED_MAJOR 0
 #define BABL_REQUIRED_MINOR 1
-#define BABL_REQUIRED_MICRO 54
+#define BABL_REQUIRED_MICRO 56
 
   babl_get_version (&babl_major_version,
                     &babl_minor_version,
diff --git a/configure.ac b/configure.ac
index 348de06ae5..ba5f069903 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,7 +43,7 @@ m4_define([gimp_stable],
 m4_define([gimp_full_name], [GNU Image Manipulation Program])
 
 # required versions of other packages
-m4_define([babl_required_version], [0.1.54])
+m4_define([babl_required_version], [0.1.56])
 m4_define([gegl_major_minor_version], [0.4])
 m4_define([gegl_micro_version], [7])
 m4_define([gegl_required_version],