fix windows build (suppress warning from lexical_cast)

indra/viewer_components/updater/llupdateinstaller.cpp

@@ -23,6 +23,9 @@
  * $/LicenseInfo$
  */
 
+#pragma warning(disable: 4702)      // disable 'unreachable code' so we can use lexical_cast (really!).
+
+
 #include "linden_common.h"
 #include <apr_file_io.h>
 #include <boost/lexical_cast.hpp>