autoconf hackery for CTypes{,ISO}

The DocBook saga continues: Look for already installed catalog first.

Always run docbook scripts with the catalog as the first argument (taken
from DOCBOOK_CATALOG).

Autoconf magic to determine a working DocBook CATALOG file (if any).  Makes
the makefile variable DOCBOOK_CATALOG refer to this CATALOG file (absolute
path).

Build hslibs first if we're bootstrapping from .hc files.

cosmetic only

Add JadeCmd to find path of jade.

Removed the SGML directories stuff. This should all be set up by the user
(who won't have to if the SGML tools are correctly installed).

Clarified comment about SGML_TOP.

Removed LITERATE, added DOCBOOK_PREFIX, and improved some comments.

Put back the '$(RM) $@' in the rule for building library modules when
splitting, until we fix this problem properly.

Removed info and texinfo support.

Point out in the comment for GhcLibHcOpts that it also applies to the
standard library and hslibs.

Typo: changed ($Var) to $(Var) in test to set SplitObjs.

Replaced SGML2INFO stuff (which is no longer supported) with SGML2PS (which
is, and may well be useful to some).

Further cleanups to the clean targets.  Don't recurse too much for
distclean and maintainer-clean.

sort out the clean targets.

- veryclean has gone away (don't know where it came from in the first
  place)

- the clean targets are now

	mostlyclean <= clean <= distclean <= maintainer-clean

/tmp/msg

Further steps towards an empty build.mk:
   * GHC is now built with -O by default
   * hslibs/tools now use GhcLibToolsHcOpts, again -O by default

Improved rules for stubs. Not perfect yet, but better than before.

wibble

- Don't rm the .o file when splitting.   Doing so
  forces grotesque amounts of recompilation

- actually add -split-objs to SRC_HC_OPTS if $(SplitObjs) == YES and
  we're building a library.

- collect together all the $(SplitObjs) stuff in one place under
  the library building code (it's only relevant for libraries).

SplitObjs=YES should now work.

Move the HC_PRE & HC_POST stuff into target.mk, so we can override
SplitObjs in the Makefile properly.

Add $(INSTALL_INCLUDES), we'll probably need it at some point.

Make splitting object files the default again on non-Windoze platforms

Fixed -split-objs and removed last vestiges of dLL_ifs.hi.

find changed to FIND, that Windows users may
ignore DOS find when PATH has gone astray.

Added FIND as a symbol so that it can be changed on OSes which have
different ideas as to what "find" should do.

Replaced $(HC_OPTS) in mkdependhs rule whence I had inadvertently removed
it along with the odir filter in which it sat.

Added SplitObjs for when -split-objs is being used. Removed -split-objs and
-odir from GhcLibHcOpts. -odir shouldn't be needed any more in any case.

Changed order of recursive makes so that recursive make happens before make
in the current directory. This helps when building hslibs as DLLs, where
the cbits DLLs need to be made before the main DLLs.

Removed redundant rules (%.dvi : %.tex &c.) that were breaking DocBook
(re)building.

Sven's first autoheader commandment: Don't change config.h.in manually...!
(Why is mk/config.h.in in the repository? configure is not, either.)

Added more SIZEOF/ALIGNMENT tests

Added autoconf magic for size/alignment of some more C types

Set SRC_SGML2XXX_OPTS variables rather than SGML2XXX_OPTS

Added SGMLSTYLESHEET variable and set SGML2XXX_OPTS to -d $(SGMLSTYLESHEET)

Add $(SGML_DOC).tex to $(CLEAN_FILES).

Changed rules to make SGML documentation using DocBook tools rather than
LinuxDoc.

Set MKDEPENDHS to $(HC) instead of $(GHC).
This means that dependencies will be computed with the same
compiler as compilations, which is presumably the right thing.