Protect the use of the VWERASE symbol by an #ifdef, it's apparently missing

Yhg1s · Yhg1s · commit 819bb2c5029b · 2001-06-11T15:25:16.000Z
on (some versions of ?) AIX.
diff --git a/Modules/termios.c b/Modules/termios.c
@@ -542,7 +542,9 @@ static struct constant {
 #ifdef VDISCARD
 	{"VDISCARD", VDISCARD},
 #endif
+#ifdef VWERASE
 	{"VWERASE", VWERASE},
+#endif
 	{"VLNEXT", VLNEXT},
 	{"VEOL2", VEOL2},
 
