clean up check for for scope test

Modules/TestForANSIForScope.cmake

@@ -4,7 +4,7 @@
 # CMAKE_NO_STD_NAMESPACE - defined accoreding to the results
 #
 
-IF(NOT CMAKE_ANSI_FOR_SCOPE)
+IF("CMAKE_ANSI_FOR_SCOPE" MATCHES "^CMAKE_ANSI_FOR_SCOPE$")
   MESSAGE(STATUS "Check for ANSI scope")
   TRY_COMPILE(CMAKE_ANSI_FOR_SCOPE  ${CMAKE_BINARY_DIR} 
     ${CMAKE_ROOT}/Modules/TestForAnsiForScope.cxx)
@@ -17,7 +17,8 @@ IF(NOT CMAKE_ANSI_FOR_SCOPE)
     SET (CMAKE_NO_ANSI_FOR_SCOPE 1 CACHE INTERNAL 
        "Does the compiler support ansi for scope.")
   ENDIF (CMAKE_ANSI_FOR_SCOPE)
-ENDIF(NOT CMAKE_ANSI_FOR_SCOPE)
+ENDIF("CMAKE_ANSI_FOR_SCOPE" MATCHES "^CMAKE_ANSI_FOR_SCOPE$")
+