fallback to the old install dirname if ooodownloadfilename is not defined

the check for versioned install dir (fdo#30837) broke creation of
languagepack on Windows and MAC; it is because ooodownloadfilename
was defined only for linux; we still need lang-specific directory
for other archs

solenv/bin/modules/installer/systemactions.pm

@@ -290,10 +290,10 @@ sub create_directories
 
         if ( $$languagesref ) { $locallanguagesref = $$languagesref; }
 
-        if ($newdirectory eq "install" )
+        if ($newdirectory eq "install" && $installer::globals::ooodownloadfilename ne "" )
         {
-            # put packages into versioned path (fdo#30837)
-            $path = $path . "$installer::globals::ooodownloadfilename";
+            # put packages into versioned path; needed only on linux (fdo#30837)
+            $path = $path . "$installer::globals::ooodownloadfilename" . $installer::globals::separator;
             create_directory($path);
         }
         else