FindQt4: Check the lower bound to exclude Qt3 as well
Merge topic 'FindQt4-ignore-qt5' into next

f7d4e0ce FindQt4: Check the lower bound to exclude Qt3 as well
FindQt4: Don't further process qmake if it does not belong to Qt4

If the only qmake that can be found belongs to Qt5 the find module
would otherwise still further interrogate it and issue diagnostics
which are specific to Qt4.
Merge topic 'FindQt4-ignore-qt5' into next

a279641a FindQt4: Don't further process qmake if it does not belong to Qt4