synchronize qmake project parser with qt creator

qt creator as of ddb918f.
not feeling like replaying the whole history ...

(cherry picked from commit f1249f94c07654f0b76e7a90fb81ed5b58cd30f7)

Conflicts:
	tools/linguist/shared/profileevaluator.cpp

Change-Id: Ief6f9bc0eed4e8a759e95ed321d158f4017710d4
Reviewed-on: http://codereview.qt-project.org/4605


Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>