Eelco Dolstra d21bfddc57 Revert "overrideDerivation: Simplify"
This reverts commit 6640000cb7148ba39bbdcca8e0cd7f5c224bce57, which
caused passthru attributes not to be passed correctly after calling
overrideDerivation.  E.g. in the evaluation of the Nix jobset:

at `deb_ubuntu1004i386' [officialRelease = false, nix = ...]:
attribute `fullName' missing
2013-05-03 11:50:39 +02:00
2013-01-19 00:02:51 +01:00
2012-06-04 03:53:25 +00:00
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