mkDerivation: Call functor when __functor is passed

Considering that no attribute value passed to mkDerivation was
allowed to be a function anyway, this does not cause any changes
for code that used the previous interpretation of __functor,
because that could wouldn't have worked anyway.

In practice, this fixes a problem when an option value from
`lib.types.functionTo` is passed as an argument here.
(`functionTo` returns a `lib.setFunctionArgs` result, which is a
__functor)

0 files changed, 0 insertions, 0 deletions