always have a trailing newline in JavaScript output

This may fix https://bugzilla.mozilla.org/show_bug.cgi?id16033

darcs-hash:20070308224331-7ad00-e5ef018706062baf6bec2bd11dfb318e0fe4b1f6.gz

lib/exe/js.php

@@ -153,6 +153,8 @@ function js_out(){
         $js = js_compress($js);
     }
 
+    $js .= "\n"; // https://bugzilla.mozilla.org/show_bug.cgi?id=316033
+
     // save cache file
     io_saveFile($cache,$js);