Correct the sense of a couple of conditional compilations -- used #ifndef
when #ifdef was needed.

This closes (reallu!) SF bug #417418.
diff --git a/Modules/termios.c b/Modules/termios.c
index 109faf3..9079351 100644
--- a/Modules/termios.c
+++ b/Modules/termios.c
@@ -536,10 +536,10 @@
 	{"VSTOP", VSTOP},
 	{"VSUSP", VSUSP},
 	{"VEOL", VEOL},
-#ifndef VREPRINT
+#ifdef VREPRINT
 	{"VREPRINT", VREPRINT},
 #endif
-#ifndef VDISCARD
+#ifdef VDISCARD
 	{"VDISCARD", VDISCARD},
 #endif
 	{"VWERASE", VWERASE},