[mingw32-qt-qmake/f14/master] Use the name 'win32-g++-fedora-cross' instead of 'win32-fedora-cross'

[epienbro]

Summary of changes:

  fa6493e... Use the name 'win32-g++-fedora-cross' instead of 'win32-fed (*)

(*) This commit already existed in another branch; no separate mail sent