Bug#324361: python-xlib: clean removes build-stamp unnecessarily

["Martin v. Löwis" <martin@v.loewis.de>]

Package: python-xlib
Version: 0.12-5
Severity: normal

debian/rules:clean should not create build-stamp, as it is not created.

-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.12-1-686-smp
Locale: LANG=de_DE@euro, LC_CTYPE=de_DE@euro (charmap=ISO-8859-15)