ENH: centralized locaiton of CMakeFiles setting

kwsysPlatformCxxTests.cmake

@@ -7,10 +7,12 @@ MACRO(KWSYS_PLATFORM_CXX_TEST var description invert)
       COMPILE_DEFINITIONS -DTEST_${var} ${KWSYS_PLATFORM_CXX_TEST_DEFINES}
       OUTPUT_VARIABLE OUTPUT)
     IF(${var}_COMPILED)
-      FILE(APPEND ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/CMakeOutput.log
+      FILE(APPEND 
+        ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
         "${description} compiled with the following output:\n${OUTPUT}\n\n")
     ELSE(${var}_COMPILED)
-      FILE(APPEND ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/CMakeError.log
+      FILE(APPEND 
+        ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
         "${description} failed to compile with the following output:\n${OUTPUT}\n\n")
     ENDIF(${var}_COMPILED)
     IF(${invert} MATCHES INVERT)