Add redirects to be cached in drupal_goto()

@deviantintegral: You'll want to add the changes from #1392974: cache control headers are not correctly added to redirects as well to this patch. Basically,

      if ($cache = drupal_page_set_cache()) {
        // When caching this redirect for the first time we still need to ensure
        // that the correct cache headers are sent.
        // @see drupal_page_footer()
        drupal_serve_page_from_cache($cache);
      }

This has one major problem:

1. User requests `/My-Page` with a completely cold cache
2. Global Redirect module says to redirect to /my-page instead with the "Case Sensitive URL Checking" enabled by default.
3. Drupal core [(patched with https://www.drupal.org/node/1678348)](https://www.drupal.org/node/1678348) includes headers that allow this redirect to be cached
4. Drupal's page cache stores the request for `/My-Page` with the header `Location: /my-page`
5. User requests `/my-page` with a now-warm page cache (because MySQL is case-insensitive by default for VARCHAR columns, like cache_page.cid)
6. Drupal's page cache response includes header to redirect the current request to /my-page, which creates an infinite redirect loop.