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configure will set INSTALL to ./install-sh if it can't find it in the path,
so we need to replace the . with the path to our root.

Patch from Christian Maeder

MERGE TO STABLE

We have 4 new flags:

  -fno-gen-manifest
     suppresses creation of foo.exe.manifest

  -fno-embed-manifest
     suppresses embedding of the manifest in the executable

  -pgmwindres
     specify a program to use instead of windres

  -optwindres
     extra options to pass to windres

"windres" is now copied from mingw and included in a binary
distribution.

We now have various flags that need to be passed to gcc, but only if
the local gcc version supports them.  So instead of wiring this
knowledge into ghc when it is built, we now put these "extra gcc
flags" into a text file in $libdir, extra-gcc-flags, which is created
by configure.  It is also created by the configure script of a binary
distribution, so a binary dist is independent of the gcc version used
to build it.

Hopefully I got the binary-dist stuff right, but binary dists aren't
currently working so we'll need to come back and check this.

Make it so that the documentation ends up where Cabal expects it to be
on Windows (prep-bin-dist-mingw used to move it).

Bindists should now work again, when doing "make install" at least.
"make in-place" is probably still broken.

Key changes:
* Always build as if BIN_DIST is 1. BIN_DIST is thus removed.
* Libraries are configured with prefix set to $$topdir rather than $(prefix)

It doesn't work yet, but I'm pretty sure that's because the bindist is
broken rather than the installer is broken.

and hopefully be a bit cleverer about finding things automatically.

Touch all the object files at the end of hc-build, as otherwise make
gets upset as the .h files are newer than them and tries to rebuild
stuff (and fails).

Print a nice message when we're finished.

Basic -fvia-C code generation is there, not much testing.

Add mising stage1/ directories to object files touched by hc-build, and
give stage=1 as an argument to make install.

Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.

The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level.  The build system now makes no
pretense at being multi-project, it is just the GHC build system.

No doubt this will break many things, and there will be a period of
instability while we fix the dependencies.  A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.