maint: Drop ChangeLog-old

This file contains the old school ChangeLog, which was manually
updated for every set of changes before the switch to git.

When libvirt was imported into git, however, *all* history was
preserved, including the changes documented in this file, and
can still be inspected using 'git log' just like more recent
changes: the format might be slightly different, but that's not
quite reason enough to treat this file any differently than the
git-generated ChangeLog we just dropped.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Makefile.am

@@ -29,7 +29,6 @@ ACLOCAL_AMFLAGS = -I m4
 
 EXTRA_DIST = \
   config-post.h \
-  ChangeLog-old \
   libvirt.spec libvirt.spec.in \
   mingw-libvirt.spec.in \
   libvirt.pc.in \