rename netbsd.500 to bsd.500

In past releases of NetHack, there was a myriad of different hints
files for different operating systems, and even different versions
of operating systems.

It made maintenance a chore, because all the variable hints files
had to be updated for a wanted change, or (as typically was the
case), some lesser-used hints files were left behind and became
outdated.

Instead of going down that road again, this renames
    sys/unix/hints/netbsd.500
to
    sys/unix/hints/bsd.500

Where things need to differ for a different bsd flavour,
the differences can be shrouded in things like

    .if ${WHICHBSD} == "NETBSD"
    .else
    .endif

This change is being done to make maintenance easier, at the
cost of making the resulting Makefiles a little more complex,
but there won't be as many separate Makefile hints to maintain.

This commit is being done instead of merging pull request #1531
which would add a new sys/unix/hints/openbsd.500 file.

Only tested on NetBSD so far. Please let us know if there's
an issue on other bsd's, and we will attempt to fix thos issues.

Closes #1531

Close

include/unixconf.h

@@ -338,7 +338,7 @@
 #endif
 
 #if defined(BSD) || defined(ULTRIX)
-#if !defined(DGUX) && !defined(SUNOS4) && !defined(__NetBSD__)
+#if !defined(DGUX) && !defined(SUNOS4) && !defined(__NetBSD__) && !defined(__FreeBSD__)
 #define memcpy(d, s, n) bcopy(s, d, n)
 #define memcmp(s1, s2, n) bcmp(s2, s1, n)
 #endif

sys/unix/hints/bsd.500

@@ -12,6 +12,10 @@
 # This hints file provides the legacy configuration that NetHack has shipped
 # with historically - this means you will most likely need to hand edit .h
 # and Makefiles.
+#
+# note: '#-INCLUDE' is not just a comment. setup.sh inserts the contents of
+#       a file found in sys/unix/hints/include
+#-INCLUDE whichbsd.500
 
 PREFIX=/usr/local
 
@@ -52,11 +56,17 @@ VARDIRPERM = 0755
 .ifdef MAKEFILE_DOC
 MAKEDEFS = ../util/makedefs
 NEEDMAKEDEFS = $(MAKEDEFS)
+
+.if ${WHICHBSD} == "NETBSD"
 .if exists (/usr/pkg/bin/groff)
 NROFF = /usr/pkg/bin/groff
 .else
 NROFF = groff
-.endif
+.endif  # ? Is NROFF groff or /usr/pkg/bin/groff
+.else   # WHICHBSD is not NETBSD
+NROFF = groff
+.endif  # WHICHBSD
+
 # NROFF_FLAGS comes from a hints file
 GUIDEBOOK = Guidebook           # regular ASCII file
 COLCMD = col -bx

sys/unix/hints/include/whichbsd.500

@@ -0,0 +1,22 @@
+#=================================================================
+# NetHack 5.0  include/whichbsd.500 $NHDT-Date: 1597332785 2020/08/13 15:33:05 $  $NHDT-Branch: NetHack-5.0 $
+#
+# 
+#
+.ifdef WHICHBSD
+.undef WHICHBSD
+.endif
+
+.if ${.MAKE.OS} == "FreeBSD"
+WHICHBSD=FREEBSD
+.elif ${.MAKE.OS} == "OpenBSD"
+WHICHBSD=OPENBSD
+.elif ${.MAKE.OS} == "NetBSD"
+WHICHBSD=NETBSD
+.else
+WHICHBSD=OTHERBSD
+.endif
+
+# End of whichbsd.500 -PRE section
+#=================================================================
+