Good evening.

Here's another version of patch that changes download URL's for Apache 
Foundation products.

What I have changed:

   * Remove Apache mirror list from download.scm, since all Apache 
projects now use it's own CDN instead of mirrors
   * Set proper download URL to dlcdn.apache.org, not download.apache.org 
mentioned earlier in this discussion. download.apache.org doesn't work. 
All download URLs on apache.org are set to dlcdn.apache.org
   * Use archive.apache.org for outdated httpd-2.4.52 package. The 'last 
resort' trick in the mirror list doesn't work because some mirrors 
return empty file when you try to download from them, guix returns 'sha 
missmatch' error.

Dmitry