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If we fail to communicate with the IO manager then we print a warning
using debugErrLn from the ghc-prim package.

These unused imports are detected by the new unused-import code

  
This only makes a difference when CHARBUF_UTF16 is in use, which it
normally isn't.  I suspect CHARBUF_UTF16 doesn't currently work for
other reasons (CHARBUF_UTF16 was an experiment before I wrote the
GHC.IO.Encoding.UTF* codecs), but this patch at least makes it
slightly closer to working.

Add a ReadP parser that succeeds at the end of input. Very useful!

We never really supported CLDouble (it was a plain old double underneath),
and pretending that we do does more harm than good.

now that it isn't used on Windows any more.

Matthias Kilian discovered that iconv_open is #define'd to something
else on OpenBSD, so the test needs to include the iconv header.

It used to only exist if (WORD_SIZE_IN_BITS == 32 || WORD_SIZE_IN_BITS == 64)

It was breaking the build on Windows. The problem was that we included
stdio.h which gave a prototype for some functions (e.g. remove), then
the AC_C_CONST meant that we did
    /* Define to empty if `const' does not conform to ANSI C. */
    #define const /**/
and then we included io.h which gave prototypes that, due to const
being removed, conflicted with the earlier prototypes.

The gcdInt# primop uses gmp internally, even though the interface is
just Int#. Since we want to get gmp out of the rts we cannot keep
gcdInt#, however it's also a bit odd for the integer package to export
something that doesn't actually use Integer in its interface. Using
gcdInteger is still not terribly satisfactory aesthetically. However
in the short-term it works and it is no slower since gcdInteger calls
gcdInt# for the special case of two small Integers.