Make Qt examples build with either Qt4 or Qt5.
1) Added conditional instructions to the CMakeList.txt files based on VTK_QT_VERSION. 2) Cleaned up the CmakeLists.txt files to make them more consistent. 3) Added QT_VERSION ifdefs, where appropriate, to take into account differences between Qt5 and Qt4. Change-Id: I738a4782dda7ef920d7418918e6ec3938f1c2297 Signed-off-by: Andrew Maclean <firstname.lastname@example.org>
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