Add kconf_update script to adapt to .desktop name change in 17.08

org.kde.kmail.desktop has been renamed to org.kde.kmail2.desktop so we need
to adjust kickoff again and we also need to adjust mimeapps.list so that using
"xdg-open mailto:..." keeps working.

src/kconf_update/CMakeLists.txt

@@ -1,6 +1,6 @@
-install(FILES kmail.upd
+install(FILES kmail.upd kmail2.upd
         DESTINATION ${KDE_INSTALL_KCONFUPDATEDIR}
 )
-install(PROGRAMS kmail-15.08-kickoff.sh
+install(PROGRAMS kmail-15.08-kickoff.sh kmail2.sh
         DESTINATION ${KDE_INSTALL_KCONFUPDATEDIR}
 )

src/kconf_update/kmail2.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+kickoffrcname=`qtpaths --locate-file  GenericConfigLocation kickoffrc`
+if [ -f "$kickoffrcname" ]; then
+   sed -i "s/\/org.kde.kmail.desktop/\/org.kde.kmail2.desktop/" $kickoffrcname
+fi
+
+mimeappsname=`qtpaths --locate-file GenericConfigLocation mimeapps.list`
+if [ -f "$mimeappsname" ]; then
+    sed -i "s/org.kde.kmail.desktop/org.kde.kmail2.desktop/" $mimeappsname
+fi

src/kconf_update/kmail2.upd

@@ -0,0 +1,5 @@
+Version=5
+
+# Update ~/.config/mimeapps.list and kickoff to match the new .desktop file name in 17.08
+Id=kmail2
+Script=kmail2.sh,sh