remove unused libxml-parser-perl dependency

over from the time where corosync was still bnased on XML configs
(pre PVE 4.0). This was not used, and XML::Parser is not Export
based, so it does not pushes some methods into the using modules
namespace

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

PVE/API2/Cluster.pm

@@ -3,8 +3,6 @@ package PVE::API2::Cluster;
 use strict;
 use warnings;
 
-use XML::Parser;
-
 use PVE::SafeSyslog;
 use PVE::Tools qw(extract_param);
 use PVE::Exception qw(raise_param_exc);

debian/control

@@ -61,7 +61,6 @@ Depends: apt-transport-https,
          liburi-perl,
          libuuid-perl,
          libwww-perl (>= 6.04-1),
-         libxml-parser-perl,
          logrotate,
          lsb-base,
          lzop,