Issue #18408: parsetok() must not write into stderr on memory allocation error

The caller gets an error code and can raise a classic Python exception.

Parser/parsetok.c

@@ -138,7 +138,6 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
     int started = 0;
 
     if ((ps = PyParser_New(g, start)) == NULL) {
-        fprintf(stderr, "no mem for new parser\n");
         err_ret->error = E_NOMEM;
         PyTokenizer_Free(tok);
         return NULL;