[Paraview] PythonQt build error

[Christoph Willing]

Building PythonQt plugin for paraview-5.2.0 fails due to use of Qt4::moc 
command in the generated file 
(build)/Plugins/PythonQtPlugin/CMakeFiles/PythonQtPlugin.dir/build.make

I can work around the problem locally by using sed in my build script to 
replace "Qt4::moc" in that file with plain "moc" just after cmake 
configuration, but it would be nicer not to have to do that.

No such problem with previous building of paraview-5.1.2.

I'm using x86_64 Linux with cmake-3.5.2, qt-4.8.7 and PythonQt from 
commontk git repo 20160810.

chris