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Which was being used seemed to be random

To improve performance of the RTS when dynamically linked on x86, I
previously disabled -fPIC for certain critical modules (the GC, and a
few others).  However, build reports suggest that the dynamic linker
on OS X doesn't like this, so I'm disabling this optimsation on that
platform.

see comment for details

This fixes a problem when building with GHC 6.12 on Windows, where
dependencies on stage 0 (bootstrapping compiler) packages have absolute
paths c:/ghc/..., and make gets confused by the colon.

This makes the RTS hooks work when doing dynamic linking

This flag seems buggy on GCC 4.1.2, which is the only GCC version we 
have that can bootstrap the SPARC build. We end up with lots of supurious
warnings of the form "cast increases required alignment of target type".
Some legitimate warnings can be fixed by adding an intermediate cast to
(void*), but we get others in rts/sm/GCUtils.c concerning the gct var
that look innocuous to me. We could enable this again once we deprecate
support for registerised builds on this arch.

This makes generating C dependencies for the RTS take 3 seconds, rather
than 30.

- 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

We now just call gcc to get the dependencies directly

This is a rerecord of
    Stephen Blackheath <oversensitive.pastors.stephen@blacksapphire.com>**20090930222855
to avoid conflicts.

ALL_RTS_LIBS is (ab)used for linking ghc when BootingFromHc=Yes,
which needs libHSrtsmain.a before libHSrts.a.

The file rts/win32/libHSbase.def contains a list of all the 
symbols from the base library that the RTS needs. 

When building the RTS into a DLL on Windows, we want to link the DLL
for the RTS before we link the DLL for the base library. We use 
libHSbase.def to make the "import library" libHSbase.so.a, which 
contains stubs for each of the symbols from the base library that
the RTS needs.

This meakes it easier to correctly clean libffi

Patch submitted by Matthias Kilian <kili@outback.escape.de>,
re-recorded against HEAD by me, with a comment added.

This means we can remove some conditional stuff from the Makefiles,
and means the testsuite doesn't have to work out whether or not it's
on Windows.

Evac_thr.c and Scav_thr.c had no dependencies

There are now 104 calls to mkdirhier, down from 1201, when validating.

- We have -m32 as machine-dependent option for gcc for a 32 bit build
- Like on OpenBSD, SL requires -fno-stack-protector to avoid triggering the
  stack smashing checks inserted by gcc by default on this platform.

The first phase of this tidyup is focussed on the header files, and in
particular making sure we are exposinng publicly exactly what we need
to, and no more.

 - Rts.h now includes everything that the RTS exposes publicly,
   rather than a random subset of it.

 - Most of the public header files have moved into subdirectories, and
   many of them have been renamed.  But clients should not need to
   include any of the other headers directly, just #include the main
   public headers: Rts.h, HsFFI.h, RtsAPI.h.

 - All the headers needed for via-C compilation have moved into the
   stg subdirectory, which is self-contained.  Most of the headers for
   the rest of the RTS APIs have moved into the rts subdirectory.

 - I left MachDeps.h where it is, because it is so widely used in
   Haskell code.
 
 - I left a deprecated stub for RtsFlags.h in place.  The flag
   structures are now exposed by Rts.h.

 - Various internal APIs are no longer exposed by public header files.

 - Various bits of dead code and declarations have been removed

 - More gcc warnings are turned on, and the RTS code is more
   warning-clean.

 - More source files #include "PosixSource.h", and hence only use
   standard POSIX (1003.1c-1995) interfaces.

There is a lot more tidying up still to do, this is just the first
pass.  I also intend to standardise the names for external RTS APIs
(e.g use the rts_ prefix consistently), and declare the internal APIs
as hidden for shared libraries.