Cygwin: dll::detach: drop declaration of unimplemented method

Signed-off-by: Corinna Vinschen <[email protected]>

(cherry picked from commit 0bb9d59)

Author: github-cygwin

winsup/cygwin/local_includes/dll_init.h

@@ -59,7 +59,6 @@ struct dll
   PWCHAR forkable_ntname;
   WCHAR ntname[1]; /* must be the last data member */
 
-  void detach ();
   int init ();
   bool stat_real_file_once ();
   void nominate_forkable (PCWCHAR);