the regexp would match twice at the end, and thus insert a stray quote.
so use a discrete loop instead.
fixed the same thing in proparser/ioutils and consoleprocess before ...

Change-Id: I62b80fb4ea68e00145861f289bc13440c5078873
Reviewed-on: http://codereview.qt.nokia.com/1302


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@nokia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>