sysdig: update to 0.1.87
Merge branch 'upstream' of https://github.com/zalora/nixpkgs

sysdig: update to 0.1.87
Revert "Many minor fixes to get things building after recent compiler changes".

This reverts the Haskell part of commit 326ca0f6900142b1, because these changes
broke the 'scientific' build with GHC 7.4.2.