Removed all instances of RETSIGTYPE from the source code:  signal
handlers "return void", according to ANSI C.
Removed the new Py_RETURN_FROM_SIGNAL_HANDLER macro.
Left RETSIGTYPE in the config stuff, because it's not clear to
me that others aren't relying on it (e.g., extension modules).
diff --git a/Parser/intrcheck.c b/Parser/intrcheck.c
index 2f151ee..a17041d 100644
--- a/Parser/intrcheck.c
+++ b/Parser/intrcheck.c
@@ -149,7 +149,7 @@
 	return PyErr_CheckSignals();
 }
 
-static RETSIGTYPE
+static void
 intcatcher(int sig)
 {
 	extern void Py_Exit(int);
@@ -168,10 +168,9 @@
 	}
 	signal(SIGINT, intcatcher);
 	Py_AddPendingCall(checksignals_witharg, NULL);
-	Py_RETURN_FROM_SIGNAL_HANDLER(0);
 }
 
-static RETSIGTYPE (*old_siginthandler)(int) = SIG_DFL;
+static void (*old_siginthandler)(int) = SIG_DFL;
 
 void
 PyOS_InitInterrupts(void)