Check SWIG string functions for some languages

bindings/hamlib.swg

@@ -52,8 +52,10 @@
 %apply double *OUTPUT { double *longitude, double *latitude };
 %apply char *OUTPUT { char *locator_res };
 
+#ifndef SWIG_CSTRING_UNIMPL
 /* longlat2locator */
 %cstring_bounded_output(char *locator_res, 13)
+#endif
 
 %immutable confparams::name;
 %immutable confparams::label;

bindings/rig.swg

@@ -225,7 +225,9 @@ typedef channel_t * const_channel_t_p;
  */
 %extend Rig {
 
+#ifndef SWIG_CSTRING_UNIMPL
 	%cstring_bounded_output(char *returnstr, MAX_RETURNSTR);
+#endif
 
 	Rig(int rig_model) {
 		Rig *r;