libselinux: fix swig bindings for 4.3.0

https://github.com/swig/swig/blob/master/CHANGES.current

"[Python] #2907 Fix returning null from functions with output
parameters.  Ensures OUTPUT and INOUT typemaps are handled
consistently wrt return type.

New declaration of SWIG_Python_AppendOutput is now:

  SWIG_Python_AppendOutput(PyObject* result, PyObject* obj, int is_void);

The 3rd parameter is new and the new $isvoid special variable
should be passed to it, indicating whether or not the wrapped
function returns void.

Also consider replacing with:

  SWIG_AppendOutput(PyObject* result, PyObject* obj);

which calls SWIG_Python_AppendOutput with same parameters but adding $isvoid
for final parameter."

Fixes: SELinuxProject#447

    selinuxswig_python_wrap.c: In function ‘_wrap_security_compute_user’:
    selinuxswig_python_wrap.c:11499:17: error: too few arguments to function ‘SWIG_Python_AppendOutput’
    11499 |     resultobj = SWIG_Python_AppendOutput(resultobj, plist);
          |                 ^~~~~~~~~~~~~~~~~~~~~~~~
    selinuxswig_python_wrap.c:1248:1: note: declared here
     1248 | SWIG_Python_AppendOutput(PyObject* result, PyObject* obj, int is_void) {
          | ^~~~~~~~~~~~~~~~~~~~~~~~
    selinuxswig_python_wrap.c: In function ‘_wrap_security_compute_user_raw’:
    selinuxswig_python_wrap.c:11570:17: error: too few arguments to function ‘SWIG_Python_AppendOutput’
    11570 |     resultobj = SWIG_Python_AppendOutput(resultobj, plist);
          |                 ^~~~~~~~~~~~~~~~~~~~~~~~
    selinuxswig_python_wrap.c:1248:1: note: declared here
     1248 | SWIG_Python_AppendOutput(PyObject* result, PyObject* obj, int is_void) {
          | ^~~~~~~~~~~~~~~~~~~~~~~~
    selinuxswig_python_wrap.c: In function ‘_wrap_security_get_boolean_names’:
    selinuxswig_python_wrap.c:12470:17: error: too few arguments to function ‘SWIG_Python_AppendOutput’
    12470 |     resultobj = SWIG_Python_AppendOutput(resultobj, list);
          |                 ^~~~~~~~~~~~~~~~~~~~~~~~
    selinuxswig_python_wrap.c:1248:1: note: declared here
     1248 | SWIG_Python_AppendOutput(PyObject* result, PyObject* obj, int is_void) {
          | ^~~~~~~~~~~~~~~~~~~~~~~~
    error: command '/usr/bin/gcc' failed with exit code 1

Suggested-by: Jitka Plesnikova <[email protected]>
Signed-off-by: Petr Lautrbach <[email protected]>

libselinux/src/selinuxswig_python.i

@@ -71,7 +71,7 @@ def install(src, dest):
 	for (i = 0; i < *$2; i++) {
 		PyList_SetItem(list, i, PyString_FromString((*$1)[i]));
 	}
-	$result = SWIG_Python_AppendOutput($result, list);
+	$result = SWIG_AppendOutput($result, list);
 }
 
 /* return a sid along with the result */
@@ -108,7 +108,7 @@ def install(src, dest):
 		plist = PyList_New(0);
 	}
 
-	$result = SWIG_Python_AppendOutput($result, plist);
+	$result = SWIG_AppendOutput($result, plist);
 }
 
 /* Makes functions in get_context_list.h return a Python list of contexts */