PyThreadState_Swap(NULL) didn't do what I thought it did. Fixes

[ 987287 ] Python 2.4a1, interpreter hanging on Keyboard Interrupt

Modules/readline.c

@@ -700,7 +700,7 @@ readline_until_enter_or_signal(char *prompt, int *signal)
 			int s;
 			PyEval_RestoreThread(_PyOS_ReadlineTState);
 			s = PyErr_CheckSignals();
-			PyThreadState_Swap(NULL);	
+			PyEval_SaveThread();	
 			if (s < 0) {
 				rl_free_line_state();
 				rl_cleanup_after_signal();

Parser/myreadline.c

@@ -84,7 +84,7 @@ my_fgets(char *buf, int len, FILE *fp)
 			int s;
 			PyEval_RestoreThread(_PyOS_ReadlineTState);
 			s = PyErr_CheckSignals();
-			PyThreadState_Swap(NULL);
+			PyEval_SaveThread();
 			if (s < 0) {
 				return 1;
 			}