BUG: Use kwsys from the source tree

Tests/CTestTest/test.cmake.in

@@ -55,5 +55,5 @@ SET (CTEST_DASHBOARD_ROOT "@CMAKE_CURRENT_BINARY_DIR@/Tests/CTestTest")
 SET (CTEST_ENVIRONMENT
 )
 
-SET (CTEST_SOURCE_DIRECTORY "@CMAKE_ROOT@/Source/kwsys")
+SET (CTEST_SOURCE_DIRECTORY "@CMake_SOURCE_DIR@/Source/kwsys")
 SET (CTEST_BINARY_DIRECTORY "@CMake_BINARY_DIR@/Tests/CTestTest/${CTEST_BINARY_NAME}")