fixes for Qt plugin makefiles

There are many usefull Qt plugins, such as qwt, qextserialport, qxt and others. With a new major version of Qt, or a new version of a compiler I have to recompile the plugins to make sure everything is working well together. However many plugins are not compilable from comandline such that the resulting files can easily be deployed. Also they should be compilable with mingw and msvc. Here I show the necessary modifications...

Windows SDK 7 messed up

I am trying to set up the Windows SDK environment for compilation of an other C++ project (Qt phonon library). However the script seems to be totally broken. It does not work and destroys the path variable. This is what the path looks like before anything is called: C:\Users\Matthias>PATH PATH=C:\Program Files\PC Connectivity Solution\;C:\Program Files\MiKTeX...