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They are now guaranteed to be YES

rather than assuming that all GNU ar's do.
Apparently OpenBSD's older version doesn't.

Patch contributed by asuffield@suffields.me.uk

libbfd pulled libm as dependency and broke LIBM= detection.

Patch moves libm in library tests as early as possible.
Thanks to asuffield for suggesting such a simple fix.
Thanks to Roie Kerstein and Renato Gallo for finding
and tracking down the issue.

- Defines a DTrace provider, called 'HaskellEvent', that provides a probe
  for every event of the eventlog framework.
- In contrast to the original eventlog, the DTrace probes are available in
  all flavours of the runtime system (DTrace probes have virtually no
  overhead if not enabled); when -DTRACING is defined both the regular
  event log as well as DTrace probes can be used.
- Currently, Mac OS X only.  User-space DTrace probes are implemented
  differently on Mac OS X than in the original DTrace implementation.
  Nevertheless, it shouldn't be too hard to enable these probes on other
  platforms, too.
- Documentation is at http://hackage.haskell.org/trac/ghc/wiki/DTrace

Also tidied up the way configure.ac gets into bindists

We only use dlltool on Windows, and this way we don't require that
the user has it installed.

Solaris's sed apparently doesn't understand [:space:]

Patches from Goetz Isenmann <info@goetz-isenmann.de>, slightly updated
for HEAD (the method for configuring platforms in configure.ac has
changed).

Not everything is fixed yet; see #3642

so if the "cd" fails we don't charge on regardless.

On some systems (bash 4?) configure fails because of it when
"gcc -V" fails.

So if something configure does fails, so does the whole configur script

This means that PACKAGE_TARNAME gets set, so the default docdir is
correct.

and fix up related cruft