* globals.cc (hntdll): Define/declare.

* exceptions.cc (inside_kernel): Don't call GetModuleFileName if we know we're
in ntdll.
* sigproc.cc (wait_sig): Initialize hntdll.

winsup/cygwin/sigproc.cc

@@ -1205,6 +1205,8 @@ wait_sig (VOID *)
   sigproc_printf ("entering ReadFile loop, my_readsig %p, my_sendsig %p",
 		  my_readsig, my_sendsig);
 
+  hntdll = GetModuleHandle ("ntdll.dll");
+
   for (;;)
     {
       DWORD nb;