Core/Build: Clean up more nonPCH-issues + fix a warning in Timer.h (unsigned/signed cast)

--HG--
branch : trunk

src/server/shared/Database/MySQLConnection.cpp

@@ -15,7 +15,12 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
+
+
+#include "Common.h"
+
 #include <mysql.h>
+
 #include "DatabaseEnv.h"
 #include "QueryResult.h"
 #include "SQLOperation.h"