* dcrt0.cc (dll_crt0_1): Move exception list and constructor stuff earlier in

the process.  Use new second argument to set_myself.
(cygwin_dll_init): Initialize exception list and constructor stuff here.
(_dll_crt0): And here.  Also, deal with inherited pinfo shared memory region
from parent.
* pinfo.cc (set_myself): Accept a second argument signifying the a shared
memory region, passed from an execing parent.
(pinfo_init): Ditto.
* pinfo.h: Ditto.
* shared.h (child_info): Add a handle field to pass to child.
* spawn.cc (spawn_guts): Create a shared handle to pass to an execed child.
* winsup.h: Remove extraneous declaration.

winsup/cygwin/shared.h

@@ -67,6 +67,12 @@ public:
   HANDLE shared_h;
   HANDLE console_h;
   HANDLE parent_alive;	// handle of thread used to track children
+  HANDLE myself_pinfo;
+  ~child_info ()
+  {
+    if (myself_pinfo)
+      CloseHandle (myself_pinfo);
+  }
 };
 
 class child_info_fork: public child_info