CString marshalling functions do not perform the specified conversion

[ross]

The CString and CStringLen marshalling functions are specified in the FFI addendum as performing a locale-based conversion, but this is not implemented.

[igloo]

We should do something about character sets in GHC at some point, but I don't think there's time in the 6.8 timeframe.

[PHO]

Locale-based conversion will cause too much confusion, because C functions may take/return UTF-8 strings while your locale is something like ja_JP.eucJP. I strongly prefer to make withCString obsolete and introduce "withCString' :: Encoding -> String -> (CString -> IO a) -> IO a" (or such like) where data Encoding = UTF_8 | UTF_16 | ISO_8859_1 | ...

[batterseapower]

Fixed by 509f28cc93b980d30aca37008cbe66c677a0d6f6 to base.