CMake Nightly Date Stamp
FindQt4: Don't further process qmake if it belongs to Qt 5.x

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

903da92e FindQt4: Don't further process qmake if it belongs to Qt 5.x
6c383f89 CMake Nightly Date Stamp