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.

win/share/safeproc.c

@@ -510,13 +510,23 @@ safe_update_inventory(int arg UNUSED)
     return;
 }
 
+#ifdef WIN32CON
+extern win_request_info *tty_ctrl_nhwindow(winid window UNUSED,
+                                          int request UNUSED,
+                                          win_request_info *wri UNUSED);
+#endif
+
 win_request_info *
 safe_ctrl_nhwindow(
     winid window UNUSED,
     int request UNUSED,
     win_request_info *wri UNUSED)
 {
+#ifdef WIN32CON
+    return (*tty_ctrl_nhwindow)(window, request, wri);
+#else
     return (win_request_info *) 0;
+#endif
 }
 
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