* dtable.h (not_open): Assure inline.

* fhandler.h (operator []): Make const.
* sync.cc (muto::~muto): Fix typo which stopped muto event handle from ever
being closed.

winsup/cygwin/cygwin.sc

@@ -105,7 +105,7 @@ SECTIONS
   }
   .cygheap BLOCK(64 * 1024) :
   {
+    __system_dlls__ = ABSOLUTE(.) ;
     __cygheap_start = ABSOLUTE(.) ;
-    __system_dlls__ = ABSOLUTE(.) + 64;
   } 
 }