build: intltool is still needed by libmypaint.

build/flatpak/org.gimp.GIMP-nightly.json

@@ -384,6 +384,26 @@
                             "sha256": "4ba9a090a42cf1e12b84c64e4464bb6fb893666841d5843cc5bef90774028882"
                         }
                     ]
+                },
+                {
+                    "//": "Copy from shared-modules to avoid submodules on dev repo.",
+                    "name": "intltool",
+                    "cleanup": [
+                        "*"
+                    ],
+                    "sources": [
+                    {
+                        "type": "archive",
+                        "url": "https://launchpad.net/intltool/trunk/0.51.0/+download/intltool-0.51.0.tar.gz",
+                        "sha256": "67c74d94196b153b774ab9f89b2fa6c6ba79352407037c8c14d5aeb334e959cd",
+                        "x-checker-data": {
+                            "type": "anitya",
+                            "project-id": 1385,
+                            "stable-only": true,
+                            "url-template": "https://launchpad.net/intltool/trunk/$version/+download/intltool-$version.tar.gz"
+                        }
+                    }
+                    ]
                 }
             ]
         },