modules/core: Fix eval for nix.binaryCaches

Besides using the default value from options, I could have just used
mkOptionDefault back then when I was writing this, but fortunately using
the default attribute from the option itself now resulted in an eval
error.

Had I used mkOptionDefault, the value just would have been silently
changed to the default value, since in
https://github.com/NixOS/nixpkgs/pull/63810 the default value now has
priority 1000 instead of 1500 (mkOptionDefault).

So since there is no longer an option default, we now can just set our
binary cache in a singleton list (with priority 100) and be done.

Signed-off-by: aszlig <aszlig@nix.build>

0 files changed, 0 insertions, 0 deletions