Fix Mac build fallout from PRODUCTEXTENSION change

PRODUCTEXTENSION used to be empty. (No idea for how long it had been
empty.) And apparently some of the "installer" Perl code implicitly
assumed PRODUCTEXTENSION was empty. At least, producing the langpack
dmg for Mac started to fail when PRODUCTEXTENSION was no longer empty.

solenv/bin/modules/installer/simplepackage.pm

@@ -278,13 +278,11 @@ sub create_package
             $folder = $packagename;
         }
 
-        # my $volume_name = $allvariables->{'PRODUCTNAME'} . ' ' . $allvariables->{'PRODUCTVERSION'}; # Adding PRODUCTVERSION makes this difficult to maintain!
         my $volume_name = $allvariables->{'PRODUCTNAME'};
         my $volume_name_classic = $allvariables->{'PRODUCTNAME'} . ' ' . $allvariables->{'PRODUCTVERSION'};
         my $volume_name_classic_app = $volume_name;  # "app" should not contain version number
-        # $volume_name = $volume_name . ' ' . $allvariables->{'PRODUCTEXTENSION'} if $allvariables->{'PRODUCTEXTENSION'}; # Adding PRODUCTEXTENSION makes this difficult to maintain!
-        $volume_name_classic = $volume_name_classic . ' ' . $allvariables->{'PRODUCTEXTENSION'} if $allvariables->{'PRODUCTEXTENSION'};
-        $volume_name_classic_app = $volume_name_classic_app . ' ' . $allvariables->{'PRODUCTEXTENSION'} if $allvariables->{'PRODUCTEXTENSION'};
+        $volume_name_classic = $volume_name_classic;
+        $volume_name_classic_app = $volume_name_classic_app;
         if ( $allvariables->{'DMG_VOLUMEEXTENSION'} ) {
             $volume_name = $volume_name . ' ' . $allvariables->{'DMG_VOLUMEEXTENSION'};
             $volume_name_classic = $volume_name_classic . ' ' . $allvariables->{'DMG_VOLUMEEXTENSION'};