[shotwell] flatpak: Add OpenCV 3.4.1 for face detection

[Jens Georg <jensgeorg src gnome org>]

commit 6cb9b312c338a047b2a6d59f6630f96a0f74e602
Author: Jens Georg <mail jensge org>
Date:   Wed Jun 6 06:04:19 2018 +0200

    flatpak: Add OpenCV 3.4.1 for face detection

 flatpak/org.gnome.Shotwell.json | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
---
diff --git a/flatpak/org.gnome.Shotwell.json b/flatpak/org.gnome.Shotwell.json
index 562e7d2b..d9f8a0af 100644
--- a/flatpak/org.gnome.Shotwell.json
+++ b/flatpak/org.gnome.Shotwell.json
@@ -136,6 +136,21 @@
                 }
             ]
         },
+        {
+            "name": "opencv",
+            "buildsystem": "cmake",
+            "builddir": true,
+            "cleanup" : ["/share/OpenCV/*.cmake", "/share/OpenCV/*.supp"],
+            "config-opts" : ["-DBUILD_TESTS=OFF", "-DBUILD_EXAMPLES=OFF", "-DBUILD_PERF_TESTS=OFF", 
"-DWITH_FFMPEG=OFF", "-DWITH_GTK=OFF", "-DWITH_GSTREAMER=OFF", "-DBUILD_opencv_apps=OFF"],
+            "sources": [
+                {
+                    "type": "git",
+                    "tag": "3.4.1",
+                    "commit" : "6ffc48769ac60d53c4bd1913eac15117c9b1c9f7",
+                    "url": "https://github.com/opencv/opencv";
+                }
+            ]
+        },
         {
             "name": "shotwell",
             "buildsystem": "meson",