cmake CMAKE_CACHEFILE_DIR examples

kpeeters/cadabra2 cmake/modules/FindMathematica.cmake :2704 

elseif ("${_cacheVariableType}" MATCHES "PATH" AND
				EXISTS "${${_CacheVariable}}" AND
				"${${_CacheVariable}}" IS_NEWER_THAN "${CMAKE_CACHEFILE_DIR}/CMakeCache.txt")