Log Message:
Update 1.1.7 -> 1.1.8

Changes:

24 Oct 2010: 1.1.8 Miek Gieben <rdup@miek.nl>
   * rdup: Check for two more I/O errors when reading files
   * rdup: Permission fix for AIX (Crispin Boylan)
   * autoconf: Fix dirfd detection on mac OS X (still does not work)

Also fix replacement of bash interpreter and link in gmp, libnettle and
libarchive so that rdup-tr is built.