Remove File::Spec<=0.83 workaround since 0.84 in 5.6.2

Author: mohawk2

lib/ExtUtils/MM_Any.pm

@@ -2773,20 +2773,6 @@ override File::Spec.
 
 
 
-=head3 catfile
-
-File::Spec <= 0.83 has a bug where the file part of catfile is not
-canonicalized.  This override fixes that bug.
-
-=cut
-
-sub catfile {
-    my $self = shift;
-    return $self->canonpath($self->SUPER::catfile(@_));
-}
-
-
-
 =head2 Misc
 
 Methods I can't really figure out where they should go yet.