32-bit compatibility for Python SWIG bindings

The ssize_t type can be int instead of long, and the pointer types are
incompatible.

Submitted upstream: <https://github.com/NLnetLabs/ldns/pull/233>

diff -ur ldns-1.8.3.orig/ldns-1.8.3/contrib/python/ldns.i ldns-1.8.3/ldns-1.8.3/contrib/python/ldns.i
--- ldns-1.8.3.orig/ldns-1.8.3/contrib/python/ldns.i	2022-08-15 12:38:22.000000000 +0200
+++ ldns-1.8.3/ldns-1.8.3/contrib/python/ldns.i	2024-01-26 11:46:55.329133288 +0100
@@ -99,12 +99,14 @@
 %typemap(in, noblock=1) (ssize_t)
 {
   int $1_res = 0;
-  $1_res = SWIG_AsVal_long($input, &$1);
+  long val;
+  $1_res = SWIG_AsVal_long($input, &val);
   if (!SWIG_IsOK($1_res)) {
     SWIG_exception_fail(SWIG_ArgError($1_res), "in method '"
       "$symname" "', argument " "$argnum" " of type '"
       "$type""'");
   }
+  $1 = val;
 }