Fix windows-build and change some warnings if configuration-files can not be read properly

- Add proper warning about missing [authserver] -tag in authserver configuration file if not found.
- Add proper warning about missing [worldserver] -tag in worldserver configuration file if not found.
Thanks to Qaston for finding the redefininition of strdup!

--HG--
branch : trunk

src/server/authserver/Main.cpp

@@ -165,7 +165,8 @@ extern int main(int argc, char **argv)
 
     if (!sConfig.SetSource(cfg_file))
     {
-        sLog.outError("Could not find configuration file %s.", cfg_file);
+        sLog.outError("\x1b[31mInvalid or missing configuration file :\x1b[0m %s", cfg_file);
+        sLog.outError("\x1b[31mVerify that the file exists and has \'\x1b[0m[authserver]\x1b[31m\' written in the top of the file!\x1b[0m");
         return 1;
     }
     sLog.Initialize();