The following patch adds a GUIX_DISABLE_NETWORK_TESTS environment
variable and disables tests that require network access when it is set.

This is needed for packaging GNU Guix in Debian, where packaging policies
prohibit network access during builds, but may not technically block network
access during builds.

If this could be considered for the upcoming 1.2 release, that would be
appreciated, though I can also carry the patches in Debian...


live well,
  vagrant