fchdir: fix dependencies

[Bruno Haible]

The fchdir module contains code that references the dup2 function, therefore
it needs to depends on the dup2 module.

2007-02-18  Bruno Haible  <address@hidden>

        * modules/fchdir (Depends-on): Add dup2.

*** modules/fchdir      28 Jan 2007 16:10:39 -0000      1.3
--- modules/fchdir      18 Feb 2007 22:40:29 -0000
***************
*** 8,13 ****
--- 8,14 ----
  
  Depends-on:
  absolute-header
+ dup2
  fcntl
  unistd
  canonicalize-lgpl