* hookapi.cc (find_first_notloaded_dll): New function.

* pinfo.cc (status_exit): New function.  Issue message when dll not found.  Use
find_first_notloaded_dll to find a nonexistent dll.
(pinfo::maybe_set_exit_code_from_windows): Call status_exit when exit code >=
0xc0000000UL.
* sigproc.cc (child_info::proc_retry): Return exit code when
STATUS_DLL_NOT_FOUND.
* spawn.cc (spawn_guts): Minor cleanup.
* syscalls.cc (close_all_files): Don't actually close stderr filehandle.  Just
make it noninheritable.
* winsup.h (find_first_notloaded_dll): Declare new function.
* ntdll.h: Add several missing NTSTATUS defines.

winsup/cygwin/sigproc.cc

@@ -32,6 +32,7 @@ details. */
 #include "cygtls.h"
 #include "sigproc.h"
 #include "exceptions.h"
+#include "ntdll.h"
 
 /*
  * Convenience defines
@@ -935,6 +936,8 @@ child_info::proc_retry (HANDLE h)
     case STILL_ACTIVE:	/* shouldn't happen */
       sigproc_printf ("STILL_ACTIVE?  How'd we get here?");
       break;
+    case STATUS_DLL_NOT_FOUND:
+      return exit_code;
     case STATUS_CONTROL_C_EXIT:
       if (saw_ctrl_c ())
 	return EXITCODE_OK;