Proposal: add clearEnv and setEnvironment to System.Posix.Env

[Paolo Capriotti]

Hi all,
System.Posix.Env doesn't currently define a binding for the POSIX
function clearenv. I propose to add:

clearEnv :: IO ()
setEnvironment :: [(String, String)] -> IO ()

'clearEnv' is a direct wrapper for the underlying function, while
'setEnvironment' is a higher-level utility function which mirrors the
interface of the existing 'getEnvironment'. See attached patches here:
http://hackage.haskell.org/trac/ghc/ticket/5648.

Discussion deadline: 24 Mar 2012.

BR,
Paolo