reader: drop kwargs declaration in the _reader.Journal.add_match registration

Drop specification of kwargs in the _reader.Journal.add_match registration. The
handling was never implemented, so any any kwargs would be summarilly ignored.

The handling of kwargs is done in the python wrapper, so no kwargs are passed
to the native C function (and would be ignored if they were). IIRC, the plan
was initially to do this in the C extension, but then we realized that this is
very much not a hot path and doing in the the wrapper is just fine.

Author: keszybz

src/systemd/_reader.c

@@ -727,7 +727,7 @@ PyDoc_STRVAR(Reader_add_match__doc__,
              "fields are combined with logical AND, and matches of the same field\n"
              "are automatically combined with logical OR.\n"
              "Match is a string of the form \"FIELD=value\".");
-static PyObject* Reader_add_match(Reader *self, PyObject *args, PyObject *keywds) {
+static PyObject* Reader_add_match(Reader *self, PyObject *args) {
         char *match;
         Py_ssize_t match_len;
         int r;
@@ -1342,7 +1342,7 @@ static PyMethodDef Reader_methods[] = {
         {"_get_all",             (PyCFunction) Reader_get_all, METH_NOARGS, Reader_get_all__doc__},
         {"_get_realtime",        (PyCFunction) Reader_get_realtime, METH_NOARGS, Reader_get_realtime__doc__},
         {"_get_monotonic",       (PyCFunction) Reader_get_monotonic, METH_NOARGS, Reader_get_monotonic__doc__},
-        {"add_match",            (PyCFunction) Reader_add_match, METH_VARARGS|METH_KEYWORDS, Reader_add_match__doc__},
+        {"add_match",            (PyCFunction) Reader_add_match, METH_VARARGS, Reader_add_match__doc__},
         {"add_disjunction",      (PyCFunction) Reader_add_disjunction, METH_NOARGS, Reader_add_disjunction__doc__},
         {"add_conjunction",      (PyCFunction) Reader_add_conjunction, METH_NOARGS, Reader_add_conjunction__doc__},
         {"flush_matches",        (PyCFunction) Reader_flush_matches, METH_NOARGS, Reader_flush_matches__doc__},