* Build Glibc with sysconfdir set to /etc. This causes it to look for

  ‘localtime’ (the default time zone definition) in /etc rather than
  $out/etc, allowing us to override the time zone globally in NixOS.

  Note that Glibc already looked in /etc for most other configuration
  files (e.g., /etc/hosts).

svn path=/nixpkgs/branches/stdenv-updates/; revision=30069