When specifying GTest as project dependency it may clash with the one included in BASIS

[schuhschuh]

Issue by schuhschuh
Wednesday Mar 18, 2015 at 19:00 GMT
Originally opened as cmake-basis/legacy#428

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When adding "GTest" as project dependency and using a system installation of the gtest library instead of the one included in BASIS, this may lead to strange compilation errors. In the particular case encountered with IRTK, a macro which was not defined in the gtest header files of the older version included in BASIS was undefined when the external gtest.h header file was included. This might be related to wrong include path order and/or include guards.