FS-6796 #comment avoid use c++ string since it causing troubles

src/mod/languages/mod_lua/freeswitch.i

@@ -43,7 +43,8 @@
 %newobject API::execute;
 %newobject API::executeString;
 
-%include "std_string.i"
+%include "typemaps.i"
+%apply int *OUTPUT { int *len };
 
 /**
  * tell swig to grok everything defined in these header files and