Add needed functions to glibc-compat for pkg

ports/glibc-compat/include/sys/fcntl.h

 /*
  * Copyright 2015 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GLIBCEMU_SYS_FCNTL_H
 #define GLIBCEMU_SYS_FCNTL_H 1
 
 #include_next <sys/fcntl.h>
 
 #include <sys/cdefs.h>
 #include <sys/types.h>
 
 __BEGIN_DECLS
 
 #define F_ULOCK 0
 #define F_LOCK  1
 #define F_TLOCK 2
+#define AT_EACCESS              1
+#define AT_SYMLINK_NOFOLLOW     2
+#define AT_SYMLINK_FOLLOW       4
+#define AT_REMOVEDIR            8
 
 #if __BSD_VISIBLE
 /* lock operations for flock(2) */
 #define LOCK_SH         0x01            /* shared file lock */
 #define LOCK_EX         0x02            /* exclusive file lock */
 #define LOCK_NB         0x04            /* don't block when locking */
 #define LOCK_UN         0x08            /* unlock file */
 #endif
 
 int lockf(int fd, int command, off_t size);
+int flock(int fd, int operation);
 
 __END_DECLS
 
 #endif