build: add Flatpak development build

The future is finally here, from this commit on you can hack in Nautilus
from any distro in a matter of minutes, and from a single click if you
are using GNOME Builder.

/me dances exhaustively

https://bugzilla.gnome.org/show_bug.cgi?id=775460

org.gnome.Nautilus.json

@@ -0,0 +1,114 @@
+{
+    "app-id": "org.gnome.Nautilus",
+    "runtime": "org.gnome.Platform",
+    "runtime-version": "master",
+    "sdk": "org.gnome.Sdk",
+    "command": "nautilus",
+    "tags": ["devel", "development"],
+    "desktop-file-name-prefix": "(Development) ",
+    "finish-args": [
+        /* X11 + XShm access */
+        "--share=ipc", "--socket=x11",
+        /* Wayland access */
+        "--socket=wayland",
+        /* Online accounts support */
+        "--talk-name=org.gnome.OnlineAccounts",
+        /* Tracker */
+        "--talk-name=org.freedesktop.Tracker1",
+        /* XXX This sucks */
+        "--filesystem=home",
+        /* Browse gvfs */
+        "--talk-name=org.gtk.vfs", "--talk-name=org.gtk.vfs.*",
+        /* Needed for dconf to work */
+        "--filesystem=xdg-run/dconf", "--filesystem=~/.config/dconf:ro",
+        "--talk-name=ca.desrt.dconf", "--env=DCONF_USER_CONFIG_DIR=.config/dconf"
+    ],
+    "build-options" : {
+        "cflags": "-O2 -g",
+        "cxxflags": "-O2 -g"
+    },
+    "cleanup": [ "/include", "/share/bash-completion" ],
+    "modules": [
+        {
+            "name": "libexif",
+            "sources": [
+                {
+                    "type": "archive",
+                    "url": "https://downloads.sourceforge.net/libexif/libexif-0.6.21.tar.bz2",
+                    "sha256": "16cdaeb62eb3e6dfab2435f7d7bccd2f37438d21c5218ec4e58efa9157d4d41a"
+                },
+                /* For arm architectures */
+                {
+                    "type": "shell",
+                    "commands": [
+                        "cp -f /usr/share/gnu-config/config.sub .",
+                        "cp -f /usr/share/gnu-config/config.guess ."
+                    ]
+                }
+            ]
+        },
+        {
+            "name": "exempi",
+            "config-opts": [
+                "--disable-unittest"
+            ],
+            "sources": [
+                {
+                    "type": "git",
+                    "url": "https://anongit.freedesktop.org/git/exempi.git"
+                }
+            ]
+
+        },
+        {
+            "name": "tracker",
+            "cleanup": [ "/bin", "/etc", "/libexec" ],
+            "config-opts": [ "--disable-miner-apps", "--disable-static",
+                             "--disable-tracker-extract", "--disable-tracker-needle",
+                             "--disable-tracker-preferences", "--disable-artwork",
+                             "--disable-tracker-writeback", "--disable-miner-user-guides"],
+            "sources": [
+                {
+                    "type": "git",
+                    "url": "https://git.gnome.org/browse/tracker"
+                }
+            ]
+        },
+        {
+            "name": "gnome-desktop",
+            "config-opts": ["--disable-debug-tools", "--disable-udev"],
+            "sources": [
+                {
+                    "type": "git",
+                    "url": "https://git.gnome.org/browse/gnome-desktop"
+                }
+            ]
+        },
+        {
+            "name": "gnome-autoar",
+            "sources": [
+                {
+                    "type": "git",
+                    "url": "https://git.gnome.org/browse/gnome-autoar"
+                }
+            ]
+        },
+        {
+            "name": "nautilus",
+            "config-opts": [
+                "--disable-static",
+                "--disable-desktop",
+                "--disable-selinux",
+                "--enable-xmp",
+                "--enable-libexif",
+                "--disable-update-mimedb"
+            ],
+            "sources": [
+                {
+                    "type": "git",
+                    "url": "https://git.gnome.org/browse/nautilus"
+                }
+            ]
+        }
+    ]
+}