automatic kbuildsycoca recreate when home dir and/or install dir changes

[Ralf Habacker]

Hi,

appended is a patch for kbuildsycoca which checks a changed home and/or 
install directory and triggers a complete recreate of the ksycoca 
database in those cases. This is required for KDE usb stick installations.

The patch is currently limited to windows, although it may also be 
usefull for unix os. In that case i would remove the conditionals. 
Please review.

Ralf





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