BUG: Fixed doc string on generated variable.

Modules/CheckFunctionExists.cmake

@@ -14,9 +14,9 @@ MACRO(CHECK_FUNCTION_EXISTS FUNCTION VARIABLE)
              CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
              OUTPUT_VARIABLE OUTPUT)
   IF(${VARIABLE})
-    SET(${VARIABLE} 1 CACHE INTERNAL "Have function ${LIBRARY}")
+    SET(${VARIABLE} 1 CACHE INTERNAL "Have function ${FUNCTION}")
   ELSE(${VARIABLE})
-    SET(${VARIABLE} "" CACHE INTERNAL "Have function ${LIBRARY}")
+    SET(${VARIABLE} "" CACHE INTERNAL "Have function ${FUNCTION}")
     WRITE_FILE(${PROJECT_BINARY_DIR}/CMakeError.log 
       "Determining if the function ${FUNCTION} exists failed with the following output:\n"
       "${OUTPUT}\n" APPEND)