[gimp] build: adding Ghostscript dependency to flatpak build.

[Jehan Pagès <jehanp src gnome org>]

commit 2bef3445de8f84207c275276530125b1a3698e82
Author: Jehan <jehan girinstud io>
Date:   Mon Jan 30 18:38:16 2017 +0100

    build: adding Ghostscript dependency to flatpak build.
    
    This is a special case build, since make must be run with "so",
    and install is `make soinstall` to get a shared library.
    See: https://ghostscript.com/doc/9.20/Make.htm#Unix_build

 build/flatpak/org.gimp.GIMP.json |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)
---
diff --git a/build/flatpak/org.gimp.GIMP.json b/build/flatpak/org.gimp.GIMP.json
index 6d290c3..d0b2756 100644
--- a/build/flatpak/org.gimp.GIMP.json
+++ b/build/flatpak/org.gimp.GIMP.json
@@ -232,6 +232,20 @@
             ]
         },
         {
+            "name": "ghostscript",
+            "config-opts": [ "--disable-cups" ],
+            "make-args": [ "so" ],
+            "make-install-args": [ "soinstall" ],
+            "cleanup": [ "/bin", "/share/man", "/share/ghostscript/9.20/doc/", 
"/share/ghostscript/9.20/examples" ],
+            "sources": [
+                {
+                    "type": "archive",
+                    "url": 
"https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/download/gs920/ghostscript-9.20.tar.xz";,
+                    "sha256": "3c0f3dc5df6f784850fa4ce7dcc3d6c56ef543af1fbaedd1d9f8d9f8b66de0ab"
+                }
+            ]
+        },
+        {
             "name": "babl",
             "config-opts": [ "--disable-docs" ],
             "sources": [