cudatoolkit65, cudatoolkit7: use python-2.7

@vcunat confirms they still build

Changed files
-2
pkgs
top-level
-2
pkgs/top-level/all-packages.nix
···
cudatoolkit65 = import ../development/compilers/cudatoolkit/6.5.nix {
inherit callPackage;
-
python = python26;
};
cudatoolkit7 = import ../development/compilers/cudatoolkit/7.0.nix {
inherit callPackage;
-
python = python26;
};
cudatoolkit = cudatoolkit5;