Remove temporary file.

autotests/libs/testresource/Messages.sh

 #! /usr/bin/env bash
 $EXTRACTRC `find . -name \*.ui` >> rc.cpp || exit 11
 $XGETTEXT *.cpp -o $podir/akonadi_knut_resource.pot
+rm -f rc.cpp

src/Messages.sh

 #! /bin/sh
 $EXTRACTRC `find -name "*.ui"` >> rc.cpp
 $XGETTEXT `find -name "*.cpp" -o -name "*.h" | grep -v '/tests/' | grep -v '/autotests/'` -o $podir/libakonadi5.pot
+rm -f rc.cpp