Fix linking to qtmain in release builds
Fix linking to qtmain in release builds

I don't know who's idea it was to change default behaviour for linking
in qtmain between minor version, then change it again (depending on the
required script version - wtf), and then use an obscure "policy" for it.
wtf again. People are probably perfectly fine with just linking a
library...
Also finding Qt5 libraries with CMake on Linux, other than the installed
ones, is a big pile sucks. Seriously.
Whatever.

HorstBaerbel/NerDisco,HorstBaerbel/NerDisco