fix reported crash of TTY_PERM_INVENT segfaulting

Options processing can be early, even before ttyDisplay is allocated.
If we find that TTY_PERM_INVENT initialization is happening too early,
just set a marker (iflags.perm_invent_pending) to try again a bit later.

The changes in win/share are just to be able to sucessfully
reproduce the original issue on Windows. It was easily reproduced
on Unix, just by building with TTY_PERM_INVENT in include/config.h
and setting OPTIONS=perm_invent in config file.

src/options.c

@@ -5384,7 +5384,11 @@ can_set_perm_invent(void)
         iflags.perminv_mode = InvOptOn;
 
 #ifdef TTY_PERM_INVENT
-    if (WINDOWPORT(tty) && !go.opt_initial) {
+    if ((WINDOWPORT(tty)
+#ifdef WIN32
+         || WINDOWPORT(safestartup)
+#endif
+         ) && !go.opt_initial) {
         perm_invent_toggled(FALSE);
         /* perm_invent_toggled()
            -> sync_perminvent()
@@ -5401,6 +5405,20 @@ can_set_perm_invent(void)
     return TRUE;
 }
 
+
+#ifdef TTY_PERM_INVENT
+void
+check_perm_invent_again(void)
+{
+    if (iflags.perm_invent_pending) {
+        iflags.perm_invent = FALSE;
+        if (can_set_perm_invent())
+           iflags.perm_invent = TRUE;
+        iflags.perm_invent_pending = FALSE;
+    }
+}
+#endif
+
 staticfn int
 handler_menustyle(void)
 {