* cygheap.h (struct cwdstuff): Remove sync member and keep_in_sync

accessors.
	* external.cc (cygwin_internal): Drop call to cygheap->cwd.keep_in_sync.
	* fhandler_disk_file.cc (fhandler_disk_file::link): Always presume
	ability to create hard links.
	* path.cc (cwdstuff::init): Drop 9x considerations.
	(cwdstuff::keep_in_sync): Remove.
	(cwdstuff::set): Take NT for granted.
	* pinfo.h (cygwin_pid): Just return pid.
	* wincap.cc: Remove has_hard_links, can_open_directories,
	has_negative_pids, has_named_pipes, has_try_enter_critical_section,
	cant_debug_dll_entry and detect_win16_exe throughout.
	* wincap.h: Ditto.

winsup/cygwin/pinfo.h

@@ -231,7 +231,7 @@ public:
 extern __inline pid_t
 cygwin_pid (pid_t pid)
 {
-  return (pid_t) (wincap.has_negative_pids ()) ? -(int) pid : pid;
+  return pid;
 }
 
 void __stdcall pinfo_init (char **, int);