allow building with static or dynamic libraries from openrpt and qt-client
first pass
simplify now that other repos no longer switch between shared and static
handle a variety of mingw-based windows mkspecs
Merge remote-tracking branch 'XTUPLE/master' into sharedLibrariesAutobuild

Conflicts:
	builder/builder.pro
	loader/loader.pro
Merge pull request #8 from gilmoskowitz/sharedLibrariesAutobuild

fix updater build to use openrpt and qt-client shared libraries