Move editor help files to editors/, add NASM version number

Move the editor help files (currently nasmtok.el) to the editors/
subdirectory in anticipation of having more such files.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>

editors/dumpbuiltin.sh

@@ -0,0 +1,20 @@
+#!/bin/sh -
+# Copyright 1996-20xx The NASM Authors - All Rights Reserved
+# SPDX-License-Identifier: BSD-2-Clause
+
+#
+# Run the nasm binary and extract the list of macros that may or may
+# not be defined in .mac files.
+#
+
+tmp="$(mktemp -d)"
+[ -n "$tmp" ] || exit 1
+
+NASM="${NASM:-../nasm}"
+
+: > "$tmp/junk.asm"
+"$NASM" -f bin -o "$tmp/junk.bin" -Lsb -l "$tmp/junk.lst" "$tmp/junk.asm"
+printf ';;; Automatically generated list of builtin macros\n'
+sed -n -E -e 's/^[^;]*;;; *(%i?(define|defalias|macro)) ([^ ]*) .*$/\1 \3/p'\
+    < "$tmp/junk.lst"
+rm -rf "$tmp"