haskell-thyme: disable unit tests

https://github.com/liyang/thyme/issues/4
haskell-vault: jailbreak to fix build with older versions of GHC
haskell-pandoc-types: Revert "update to version 1.12"

This reverts commit 17f8b638378077946e77071040c80630bf23e0f5. The new version
breaks Pandoc, curiously enough. Who would have thought? Everyone seems to be
going Snoyman these days.
haskell-tagsoup: Revert "update to version 0.13"

This reverts commit d0b0d530b65c801709ab2706534fa7a6f7cc69b7. The new version
breaks the build of Pandoc.
Merge remote-tracking branch 'origin/master' into stdenv-updates.