COMP: Add missing cmake file

CMakeEmptyInputFile.in

+@CMAKE_EMPTY_INPUT_FILE_CONTENT@

CheckCXXSourceRuns.cmake

@@ -29,7 +29,7 @@ MACRO(CHECK_CXX_SOURCE_RUNS SOURCE VAR COMMENT)
       SET(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES)
     ENDIF(CMAKE_REQUIRED_INCLUDES)
     SET(CMAKE_EMPTY_INPUT_FILE_CONTENT "${SOURCE}")
-    CONFIGURE_FILE("${VTK_SOURCE_DIR}/CMake/CMakeEmptyInputFile.in"
+    CONFIGURE_FILE("${CMAKE_CURRENT_SOURCE_DIR}/CMakeEmptyInputFile.in"
       "${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/src.cxx")
 
     MESSAGE(STATUS "Performing Test ${COMMENT}")