[gimp] build: update flatpak builds with latest changes.

[Jehan Pagès <jehanp src gnome org>]

commit 8f71aeda3da3399514b3c15fa3c777e89d312230
Author: Jehan <jehan girinstud io>
Date:   Mon Mar 19 17:42:49 2018 +0100

    build: update flatpak builds with latest changes.
    
    Untested. Hopefully should build.
    Also bump the GNOME runtime to the latest version.

 build/flatpak/flathub                    |    2 +-
 build/flatpak/org.gimp.GIMP-dev.json     |    2 +-
 build/flatpak/org.gimp.GIMP-nightly.json |   18 ++++++++++++++++--
 3 files changed, 18 insertions(+), 4 deletions(-)
---
diff --git a/build/flatpak/flathub b/build/flatpak/flathub
index 2f9a336..1c24cce 160000
--- a/build/flatpak/flathub
+++ b/build/flatpak/flathub
@@ -1 +1 @@
-Subproject commit 2f9a3362289727807db5b74d6ebf426d8a1f09a7
+Subproject commit 1c24cce9aa8d2689308ddac12dc03f6a238255f7
diff --git a/build/flatpak/org.gimp.GIMP-dev.json b/build/flatpak/org.gimp.GIMP-dev.json
index f8f7cbd..1596a67 100644
--- a/build/flatpak/org.gimp.GIMP-dev.json
+++ b/build/flatpak/org.gimp.GIMP-dev.json
@@ -4,7 +4,7 @@
     "base": "org.gimp.BaseApp",
     "base-version": "stable",
     "runtime": "org.gnome.Platform",
-    "runtime-version": "3.24",
+    "runtime-version": "3.28",
     "sdk": "org.gnome.Sdk",
     "command": "gimp-2.9",
     "rename-desktop-file": "gimp.desktop",
diff --git a/build/flatpak/org.gimp.GIMP-nightly.json b/build/flatpak/org.gimp.GIMP-nightly.json
index 210d552..e15cb83 100644
--- a/build/flatpak/org.gimp.GIMP-nightly.json
+++ b/build/flatpak/org.gimp.GIMP-nightly.json
@@ -4,7 +4,7 @@
     "base": "org.gimp.BaseApp",
     "base-version": "stable",
     "runtime": "org.gnome.Platform",
-    "runtime-version": "3.24",
+    "runtime-version": "3.28",
     "sdk": "org.gnome.Sdk",
     "command": "gimp-2.9",
     "rename-desktop-file": "gimp.desktop",
@@ -81,7 +81,21 @@
                     "sha256": "66d02b229d2ea9474e62c2b6cd6720fde946155cd1d0d2bffdab829790a0fb22"
                 }
             ]
-       },
+        },
+        {
+            "name": "openjpeg",
+            "cmake": true,
+            "buildsystem": "cmake-ninja",
+            "builddir": true,
+            "cleanup": [ "/bin", "/lib/openjpeg-2.3" ],
+            "sources": [
+                {
+                    "type": "archive",
+                    "url": "https://github.com/uclouvain/openjpeg/archive/v2.3.0.tar.gz";,
+                    "sha256": "3dc787c1bb6023ba846c2a0d9b1f6e179f1cd255172bde9eb75b01f1e6c7d71a"
+                }
+            ]
+        },
         {
             "name": "babl",
             "config-opts": [ "--disable-docs" ],