pkgs/top-level/all-packages.nix: dropped getConfig support for Python 2.7
pkgs/top-level/all-packages.nix: dropped getConfig support for Python 2.7

Python 2.7 can no longer be configured using the obsolete "getConfig"
mechanism. Instead, use "override" to fine-tune the installation.

svn path=/nixpkgs/trunk/; revision=23143

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