* include/cygwin/grp.h: New file.

* include/cygwin/stat.h: Ditto.
	* include/cygwin/types.h: Add definitions for __off32_t,
	__off64_t, off_t, __uid16_t, __uid32_t, uid_t, __gid16_t,
	__gid32_t and gid_t.
	* include/sys/cygwin.h: Use correct uid and gid types.

winsup/cygwin/include/cygwin/grp.h

@@ -0,0 +1,43 @@
+/* cygwin/grp.h
+
+   Copyright 2002 Red Hat Inc.
+   Written by Corinna Vinschen <corinna@vinschen.de>
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#ifndef _CYGWIN_GRP_H_
+#define _CYGWIN_GRP_H_
+
+#include <sys/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __INSIDE_CYGWIN__
+struct __group16
+{
+  char *gr_name;
+  char *gr_passwd;
+  __gid16_t gr_gid;
+  char **gr_mem;
+};
+
+struct __group32
+{
+  char *gr_name;
+  char *gr_passwd;
+  __gid32_t gr_gid;
+  char **gr_mem;
+};
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _CYGWIN_GRP_H_ */