qmake repeats include paths in the command line for moc

qmake repeats include paths in the command line for moc, which can make the command line exceed the 2000 character limit for command lines on windows 2000. The support for response files that should prevent moc from being called with such long lines is handling this based on number of include paths in total, independent of the individual length - which can make the problem persist.

Removing the repeats and unnecessary includes should bring the command line down to something small enough to build.