use custom function instead of RT::Record->Update

Update method does s/\r\n/\n/g on values. This change
of values is not visible, but if combined with ExternalAuth
can result in regular change of a field back and forth.

lib/RT/Extension/LDAPImport.pm

@@ -664,7 +664,7 @@ sub create_rt_user {
         if ($RT::LDAPUpdateUsers || $RT::LDAPUpdateOnly) {
             $self->_debug("$message, updating their data");
             if ($args{import}) {
-                my @results = $user_obj->Update( ARGSRef => $user, AttributesRef => [keys %$user] );
+                my @results = $self->update_rt_user( user => $user_obj, info => $user );
                 $self->_debug(join("\n",@results)||'no change');
             } else {
                 $self->_debug("Found existing user $user->{Name} to update");
@@ -701,6 +701,25 @@ sub create_rt_user {
 
 }
 
+sub update_rt_user {
+    my $self = shift;
+    my %args = @_;
+
+    my @results;
+    my $user = $args{'user'};
+    while ( my ($field, $new) = each %{ $args{'info'} } ) {
+        next unless defined $new;
+
+        my $old = $user->$field();
+        next if defined $old && $old eq $new;
+
+        my $method = "Set$field";
+        my ($status, $msg) = $user->$method( $new );
+        push @results, $user->loc('User [_1]: [_2]', $user->Name, $msg);
+    }
+    return @results;
+}
+
 sub _load_rt_user {
     my $self = shift;
     my %args = @_;