Remove XXX from dependencies

lib/Slic3r/Format/AMF.pm

@@ -2,7 +2,6 @@ package Slic3r::Format::AMF;
 use Moo;
 
 use Slic3r::Geometry qw(X Y Z);
-use XXX;
 
 sub read_file {
     my $self = shift;

lib/Slic3r/Format/AMF/Parser.pm

@@ -3,7 +3,6 @@ use strict;
 use warnings;
 
 use XML::SAX::PurePerl;
-use XXX;
 
 use base 'XML::SAX::Base';
 

lib/Slic3r/Format/STL.pm

@@ -2,7 +2,6 @@ package Slic3r::Format::STL;
 use Moo;
 
 use Slic3r::Geometry qw(X Y Z triangle_normal);
-use XXX;
 
 sub read_file {
     my $self = shift;