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/Modules/fpectlmodule.c b/Modules/fpectlmodule.c
index 8055636..039deb4 100644
--- a/Modules/fpectlmodule.c
+++ b/Modules/fpectlmodule.c
@@ -77,7 +77,7 @@
static int PyFPE_counter = 0;
#endif
-typedef RETSIGTYPE Sigfunc(int);
+typedef void Sigfunc(int);
static Sigfunc sigfpe_handler;
static void fpe_reset(Sigfunc *);