Merge pull request #5124 from iyzsong/performous

performous: new package
c2hsc: move to development/tools
c2hs: update and move to development/tools
git: Support $SSL_CERT_FILE
Remove unnecessary $GIT_SSL_CAINFO from sys env
New package: git-extras
haskell-distributed-process-monad-control add from Hackage
python-robomachine: add myself (bjornfor) as maintainer
Merge pull request #5131 from spwhitt/git-extras

New package: git-extras
Merge pull request #5033 from michelk/saga_2.1.4

saga: update from 2.1.2 to 2.1.4 and re-enable build on x86_64-linux
Merge pull request #5115 from iu-parfunc/racket

racket: add libreadline to ffi libs - enables xrepl.
Merge pull request #5119 from jeremyjh/dp-monad-control

haskell-distributed-process-monad-control add from Hackage
zim: update from 0.61 to 0.62
cabal: add support for "editedCabalFile" attribute to address https://github.com/NixOS/cabal2nix/issues/84

When 'editedCabalFile' is set to an SHA256 hash, the build driver replaces the
original Cabal instructions with the new version that is downloaded from
"http://hackage.haskell.org/package/${fname}/${pname}.cabal".
haskell-twitter-conduit: use new editedCabalFile feature
haskell-pandoc: use new editedCabalFile feature
rethinkdb: upgrade to 1.15.2
Merge pull request #5128 from abbradar/c2hs

Move c2hs/c2hsc into tools, update
Mediawiki: updated for Apache 2.4
fontconfig: avoid questionmark in patch name on darwin

Close #5135.
@vcunat made this conditional to avoid rebuild for now.