[CMake] FindQt4 regression (changing QT_QMAKE_EXECUTABLE)

[Simon Sasburg]

I've run into a problem after updating my cmake in using the FindQt4 module.

It used to be the case that when QT_QMAKE_EXECUTABLE was changed by the
user or by a SET(... FORCE) command, all the derived cache entries would be
refreshed, however this does not work anymore.

The cause seems to be git commit 21123416b4c2d49fe981279b10fbc78c8d07c491
which removes the following code:

  if(QT_QMAKE_EXECUTABLE_LAST)
    string(COMPARE NOTEQUAL "${QT_QMAKE_EXECUTABLE_LAST}"
"${QT_QMAKE_EXECUTABLE}" QT_QMAKE_CHANGED)
  endif()
  set(QT_QMAKE_EXECUTABLE_LAST "${QT_QMAKE_EXECUTABLE}" CACHE INTERNAL ""
FORCE)

I've attached a patch that restores this code so this works again, could
this be included in the next cmake release?

Best regards,
Simon
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