[shotwell] flatpak: Disable unit tests for exiv2

[Jens Georg <jensgeorg src gnome org>]

commit bc3d5c3f9d16c2a8243df8d5aa878b6b2bb7f0ad
Author: Jens Georg <mail jensge org>
Date:   Sun May 3 12:31:31 2020 +0200

    flatpak: Disable unit tests for exiv2

 flatpak/org.gnome.Shotwell.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/flatpak/org.gnome.Shotwell.json b/flatpak/org.gnome.Shotwell.json
index 8f080858..aef52e26 100644
--- a/flatpak/org.gnome.Shotwell.json
+++ b/flatpak/org.gnome.Shotwell.json
@@ -111,7 +111,8 @@
                 "-DCMAKE_INSTALL_LIBDIR=lib",
                 "-DCMAKE_BUILD_TYPE=Release",
                 "-DEXIV2_BUILD_EXIV2_COMMAND=OFF",
-                "-DEXIV2_BUILD_SAMPLES=OFF"
+                "-DEXIV2_BUILD_SAMPLES=OFF",
+                "-DEXIV2_BUILD_UNIT_TESTS=OFF"
             ],
             "sources" : [
                 {