Generate the Qt5LinguistConfig.cmake files independent of QtUiTools.

Generate the Qt5LinguistConfig.cmake files independent of QtUiTools.

The generation relied on the uitools module for the version, so
if it was not available, we got errors like this:

 WARNING: Cannot open substitute for output '/cmake/Qt5LinguistTools/Qt5LinguistToolsConfig.cmake'
 WARNING: Cannot open substitute for output '/cmake/Qt5LinguistTools/Qt5LinguistToolsConfigVersion.cmake'
 WARNING: Cannot open substitute for output '/cmake/Qt5LinguistTools/Qt5LinguistToolsMacros.cmake'

 http://testresults.qt-project.org/ci/QtTools_stable_Integration/build_00128/linux-g++_no-widgets_Ubuntu_12.04_x64/log.txt.gz

Use MODULE_VERSION for the version instead and MODULE_BASE_OUTDIR for the
generation location.

Change-Id: I9daa6878553015e841b6e41fd1f64eb60ada7774
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>