ERR: Fixed unused parameter warnings.

Source/cmSystemTools.cxx

@@ -1061,12 +1061,15 @@ bool cmSystemTools::StringEndsWith(const char* str1, const char* str2)
   return !strncmp(str1 + (strlen(str1)-strlen(str2)), str2, strlen(str2));
 }
 
-bool cmSystemTools::CreateSymlink(const char* origName, const char* newName)
+#if defined(_WIN32) && !defined(__CYGWIN__)
+bool cmSystemTools::CreateSymlink(const char*, const char*)
 {
-#if !defined(_WIN32) || defined(__CYGWIN__)
-  return (symlink(origName, newName) >= 0);
-#else
   // Should we create a copy here?
   return false;
-#endif
 }
+#else
+bool cmSystemTools::CreateSymlink(const char* origName, const char* newName)
+{
+  return (symlink(origName, newName) >= 0);
+}
+#endif