osx support: change to 10.11

Change-Id: If3556b90988eb6002e34cf53dba316c85f792c0e
Reviewed-by: Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>

cmake/MacOSXBundleInfo.plist.in

@@ -29,7 +29,7 @@
     <key>CFBundleSignature</key>
     <string>????</string>
     <key>LSMinimumSystemVersion</key>
-    <string>10.10</string>
+    <string>10.11</string>
     <key>CFBundleVersion</key>
     <string>${MACOSX_BUNDLE_BUNDLE_VERSION}</string>
     <key>CSResourcesFileMapped</key>