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 * use --nonet, so xmllint and co don't go off trying to download
   stuff from the web

 * use the http:// reference for the stylesheet, so we don't have to
   search the filesystem for it (should speedup ./configure)

I've also added some missing $s to some makefiles. These aren't
technically necessary, but it's nice to be consistent.

You can't Haddock a library until it's built. Previously that happened
automatically because
  Haddock itself was built with stage2
  And all the libraries were built with stage1
But now DPH is built with stage2, so Haddock can get to work too
early.

This patch adds the missing dependency (thanks to Simon M)

We were looking at HADDOCK_DOCS instead of $$(HADDOCK_DOCS)

It tried to do this already, but the make variable name was wrong.

This is now the same as the old default. Currently we cannot embed
rpaths because they would point to the build tree. We should embed
rpaths relative to the $ORIGIN in future.

libraries built by stage2 need all their bits in the bindist too.
We were testing (stage == 1) rather than (stage /= 0).

we also have $1_$2_CONFIGURE_OPTS, which is used.

Now we have variables for whether or not to build the docbook docs as
HTML, as PS, and as PDF. The configure script output now matches what
the build system will do (except it cannot take account of any
mk/build.mk settings, of course).

Unlike with static libs, when linking shared libs the dependencies
have to already exist. Add a dependency $1_$2_$3_LIBS : $1_$2_$3_DEPS_LIBS

when we configure ghc with --enable-shared

This allows the library file type to depend on the way. This is needed
to use .so/.dll libs for the "dyn" way rather than always using .a libs.
For example: thr_debug_dyn_libsuf="_thr_debug-ghc6.11.20090426.so"