Without unixutils Creator does not link on Windows anymore.
The reason is FileUtils::showInGraphicalShell()
which calls UnixUtils::fileBrowser() and
UnixUtils::substituteFileBrowserParameters().

Since UnixUtils compile on Windows I added them.
Propably UnixUtils should be merged into FileUtils,
if they are used and make sense on all platforms.

Change-Id: I3fb49fb2c0c54fb9336298f006e2937ae29d413b
Reviewed-by: hjk <qthjk@ovi.com>