While evaluating the derivation of xbursttools:
the condition `pkgs.stdenv ? overrides` causes the evaluation of
`stdenvCross`. This evaluation comes too early during the execution, as
it prevents the resolution of names such as `pkgs.lib`, and
`stdenvAdapaters.makeStdenvCross`, which we want to take from `pkgs`
instead of `self` in following patches.
By swapping the conditions, we effectively make the resolution of `pkgs.lib`
and `stdenvAdapaters.makeStdenvCross` possible through the pkgs attribute.
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