[niepce] flatpak: Bump to exempi 2.5.0

[Hubert Figuière <hub src gnome org>]

commit 16776ced22c1f3f2c0eff02de8555876cbfca8f7
Author: Hubert Figuière <hub figuiere net>
Date:   Sun Jan 6 00:13:04 2019 -0500

    flatpak: Bump to exempi 2.5.0

 flatpak/org.gnome.Niepce.json | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)
---
diff --git a/flatpak/org.gnome.Niepce.json b/flatpak/org.gnome.Niepce.json
index edb26a7..45d604e 100644
--- a/flatpak/org.gnome.Niepce.json
+++ b/flatpak/org.gnome.Niepce.json
@@ -279,18 +279,11 @@
         },
         {
             "name" : "exempi",
-            "build-options": {
-                "cxxflags": "-fvisibility=hidden"
-            },
             "sources" : [
                 {
                     "type" : "archive",
-                    "url" : "https://libopenraw.freedesktop.org/download/exempi-2.4.5.tar.bz2";,
-                    "sha256" : "406185feb88e84ea1d4b4251370be2991205790d7113a7e28e192ff46a4f221e"
-                },
-                {
-                    "type": "patch",
-                    "path": "exempi-api-export.diff"
+                    "url" : "https://libopenraw.freedesktop.org/download/exempi-2.5.0.tar.bz2";,
+                    "sha256" : "dc82fc24c0540a44a63fa4ad21775d24e00e63f1dedd3e2ae6f7aa27583b711b"
                 }
             ]
         },