Added support for building against Qt5
One can explicitly enable building against Qt5 by configuring QtTesting with -DQtTesting_QT_VERSION:STRING="5". To specify custom Qt5 install paths, use -DCMAKE_PREFIX_PATH:STRING=/home/sankhesh/Projects/qt5/qt5.2.0/5.2.0/gcc_64 Qt5 is built and packaged with the -reduce-relocations configure option as default. This causes compilations to run with the -Bsymbolic-functions option, which makes function pointer comparison ineffective, unless the -fPIE flag is also supplied. Added Qt5 compile flags to support position independent code.
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