First pass at a hints-based build system to augment (not replace) the existing

build system.

Anyone who wants to do a build from sys/unix and doesn't want to figure this
out just needs to do:
	sh setup.sh hints/unix
instead of:
	sh setup.sh
and then continue on as usual.

New files:
sys/unix/NewInstall.unx - the new directions
sys/unix/hints/* - the hints files.  There will be more later.
sys/unix/mkmkfile.sh - helper for setup.sh

Summary of changes:
see NewInstall.unx for info on the new build system
introduction of various preprocessor symbols to turn options off that
 are defaulted on historically
comment out nethackrc (and similar) entries that still use the old symbol
 syntax.
commenting out of Makefile.* lines that now come from hints/unix
GAMEDIR is replaced with HACKDIR so the Makefiles and the C source agree.
  Note that I have NOT changed the docs and/or Makefiles for be, msdos, os2,
  vms, or winnt.  If port maintainers don't then I will, but I can't test
  those ports.
nethack.sh now handles the font path automatically

sys/unix/nethack.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-#	SCCS Id: @(#)nethack.sh	3.5	1990/02/26
+#	SCCS Id: @(#)nethack.sh	3.5	2007/12/12
 
 HACKDIR=/usr/games/lib/nethackdir
 export HACKDIR
@@ -15,6 +15,12 @@ x)	XUSERFILESEARCHPATH="$HACKDIR/%N.ad"
 esac
 export XUSERFILESEARCHPATH
 
+# Get font dir added, but only once (and only if there's an xset to be found).
+xset p >/dev/null 2>&1 && (
+	xset fp- $HACKDIR >/dev/null 2>&1;
+	xset fp+ $HACKDIR
+)
+
 # see if we can find the full path name of PAGER, so help files work properly
 # assume that if someone sets up a special variable (HACKPAGER) for NetHack,
 # it will already be in a form acceptable to NetHack