Bug#439218: should recommend xfonts-base

[Robert Millan <rmh@aybabtu.com>]

Package: xserver-xorg
Version: 1:7.1.0-19
Severity: normal

In the vast majority of cases, xfonts-base is necessary for this package to
be useful.  Could you consider putting it in Recommends ?

  $ X :1
  [...]
  Fatal server error:
  No valid FontPath could be found.

-- System Information:
Debian Release: 4.0
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-5-amd64
Locale: LANG=ca_AD.UTF-8, LC_CTYPE=ca_AD.UTF-8 (charmap=UTF-8)