cmake: Add ugly hack from meta-qt5 to prevent cmake trying to detect qt5
* cmake doesn't have dependency on qt4/qt5, so these tests usually fail
but still can cause undeterministic results or build failures (when
OE_QMAKE_PATH_EXTERNAL_HOST_BINS is undefined or native qmake removed
while running the test in cmake)
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Saul Wold <sgw@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
