Reduce noise if there's no in-tree version of Happy.

Patches to configuration script for MSYS.  It's not clear that this'll
always work, because we generate paths like /c/mingw/bin, which MinGW
binaries won't understand -- but all of them seem to be fed to the
MSYS shell, which translates them to c:/mingw/bin etc.

Perhaps the Right Thing is to implement msyspath, by analogy with
cygpath, to convert /c/xxx to c:/xxx? 

Anyway, this patch seems to work for now.

Happy 1.14 is needed to compile the HEAD these days.

Removed unused macros

Cleaned up libm detection

Use new FP_CHECK_FUNC macro instead of the slightly obscure FPTOOLS_TRY_LINK_NOWARN

Synched with latest changes in Hugs' aclocal.m4 (wglGetProcAddress
fiddling)

To get wglGetProcAddress on Windows, we have to link with
opengl32.dll, too, even when we are using Cygwin with X11.

Completely overhauled OpenGL/GLUT detection magic, making things more
modular. Removed support for Mesa and non-HW-accelerated support on
Windoze. Added initial support for handling missing glut.h header on
MinGW/MSYS (to be completed). Tested on Cygwin (plain, -mno-cygwin,
--without-x), MSYS/MinGW and SuSE 8.2 x86 Linux.

FP_EMPTY_STRUCTS: empty struct feature test

Synched with hugs98 repository again (X_FLAGS handling this time)

Merge to STABLE.

Synched with latest changes in hugs98 repository (finding "find" plus
#ifdef massage). Some common autoconf macro directory would be really
handy: ToDo...

supply missing AC_DEFINE_UNQUOTED() descr arg

oops, fix 'test' usage

FPTOOLS_CHECK_HTYPE: mapping unsupported types to NotReallyAType is less than useful; simply don't define the symbol

Merged Ross' patch for Hugs:

Tweak to the FPTOOLS_HAVE_OPENGL: when testing for the GLUT lib,
include the GL/GLU/GLX libs just discovered.  While most platforms
don't require this, mysteriously some (e.g. OpenBSD) do.

Uncomment Alex version test: Alex 2.0 is now required to build GHC.

green-card => greencard
Green Card => GreenCard

Although Alastair prefers "Greencard", the library's name is
"Foreign.GreenCard", and unless we change this, too, "GreenCard" is
more consistent.

Revamped version comparison test (no bash-isms, more conservative)

OpenBSD's sh doesn't like the parentheses in "foo='(-1)'" so let's
drop them. Thanks to Don for pointing this out.

Nuked FPTOOLS_O_BINARY test and use FP_CHECK_CONST instead, which is
shorter and better (e.g. cross compilation).

* Cleaned up FP_CHECK_ALIGNMENT test a bit.

* Nuked FPTOOLS_CHECK_CCONST test in favour of a more general one
  which handles cross compilation and languages different from C.

Nuked the broken FPTOOLS_CC_FLAG test and added a more general
FP_CHECK_FLAG test instead.

Nuked FPTOOLS_MSGHDR_MSG_ACCRIGHTS and FPTOOLS_MSGHDR_MSG_CONTROL
tests. Use autoconf's own macros for dealing with struct members.

Death to the acconfig.h hack!

Expand the (a bit faulty) definition of AC_MSG_FAILURE, which is only
available since autoconf 2.57. Thanks to Don for pointing this out.

Renamed FP_ALTZONE to FP_DECL_ALTZONE

Revamped FPTOOLS_PROG_DIFF

Nuked AC_C_PROTOTYPES macro. We don't need the result and newer
autoconfs come with their own definition.

Nuked unused macro FPTOOLS_IN_SCOPE

* Revamped macro for alignment test
* Fixed a few tests for "long long"s

Nuked FPTOOLS_C_LONG_LONG, AC_CHECK_TYPES already does what we want.

AC_PROG_LEX really checks for the existence of "lex" when "flex" is
not found, so there is no need for AC_PROG_LEX_STRICT.

Furthermore, flex/lex is not really needed for building GHC, so we
issue only a warning instead of dying when flex and lex are not found.

Nuked unused FPTOOLS_PROG_YACCY test and support for yacc/bison in
general. If it is ever needed again, it can easily be resurrected.

Nuked unused FPTOOLS_REGEX_IN_LIBC test

Revamped altzone detection. Note that we test only for successful
compilation now, not for successful linking, but this is what most
autoconf macros do.

* Following the autoconf coding style recommendations, use "#" for
  comments, not "dnl".

* Local macros will get the prefix "FP_" instead of "FPTOOLS_". The
  latter is a bit heavyweight and too fptools-centric.

Nuked unused tests FPTOOLS_HAVE_TIMEZONE and FPTOOLS_TYPE_TIMEZONE

CVS keywords considered harmful

OpenBSD x86 has finally moved to ELF.
So it no longer needs a leading underscore on symbols.
However, like FreeBSD, it tries to be friendly, and accept it
anyway. So we have to hard code it.