Merge pull request #231 from wsfulton/swig-4.2.0-support

const ldns_rdf * typemap fixes to support swig-4.2.0

diff --cc contrib/python/ldns_rdf.i
index 60daf1a72842d5ea5d95cc71f80b74ee106e23ed,4924b979cfa0bef0b63895c5188f12eae15f162f..39f9af1895cb830868da5a91cef44a399224a8fd
--- 1/contrib/python/ldns_rdf.i
--- 2/contrib/python/ldns_rdf.i
+++ b/contrib/python/ldns_rdf.i
@@@ -110,9 -95,53 +111,54 @@@
      /* Is not NULL only when a conversion form string occurred. */
      SWIG_Python_str_DelForPy3($1_str); /* Is a empty macro for Python < 3. */
    }
 +#endif
  }
  
+ #else
+ /*
+  * Automatic conversion of const (ldns_rdf *) parameter from string.
+  * Argument default value.
+  */
+ %typemap(arginit, noblock=1) const ldns_rdf *
+ {
+   PyObject *$1_bytes = NULL;
+ }
+ 
+ /*
+  * Automatic conversion of const (ldns_rdf *) parameter from string.
+  * Preparation of arguments.
+  */
+ %typemap(in, noblock=1) const ldns_rdf * (void* argp, $1_ltype tmp = 0, int res)
+ {
+   if (Python_str_Check($input)) {
+     const char *$1_str = SWIG_PyUnicode_AsUTF8AndSize($input, NULL, &$1_bytes);
+     if ($1_str == NULL) {
+       %argument_fail(SWIG_TypeError, "char *", $symname, $argnum);
+     }
+     tmp = ldns_dname_new_frm_str($1_str);
+     if (tmp == NULL) {
+       %argument_fail(SWIG_TypeError, "char *", $symname, $argnum);
+     }
+     $1 = ($1_ltype) tmp;
+   } else {
+     res = SWIG_ConvertPtr($input, &argp, SWIGTYPE_p_ldns_struct_rdf, 0 | 0);
+     if (!SWIG_IsOK(res)) {
+       %argument_fail(res, "ldns_rdf const *", $symname, $argnum);
+     }
+     $1 = ($1_ltype) argp;
+   }
+ }
+ 
+ /*
+  * Automatic conversion of const (ldns_rdf *) parameter from string.
+  * Freeing of allocated memory (it's a no op unless compiling for some older versions of the Python stable ABI).
+  */
+ %typemap(freearg, noblock=1) const ldns_rdf *
+ {
+   Py_XDECREF($1_bytes);
+ }
+ #endif
+ 
  %nodefaultctor ldns_struct_rdf; /* No default constructor. */
  %nodefaultdtor ldns_struct_rdf; /* No default destructor. */