Add bison 2.3

This is required for perl 5.10.1.

sysa/bison-2.3/import-gnulib.sh

@@ -0,0 +1,55 @@
+#!/bin/sh
+
+# SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+set -e
+
+gnulib_modules='
+argmatch
+dirname
+error
+exitfail
+extensions
+getopt
+gettext
+hard-locale
+hash
+malloc
+mbswidth
+obstack
+quote
+quotearg
+stdbool
+stdio-safer
+strerror
+strtoul
+strverscmp
+unistd-safer
+unlocked-io
+verify
+xalloc
+xalloc-die
+xstrndup
+'
+
+# Copy over needed files
+for i in ${gnulib_modules}; do
+    for f in $(../gnulib-b28236b/gnulib-tool --extract-filelist "${i}") \
+        lib/wcwidth.h; do
+        cp -pf "../gnulib-b28236b/${f}" "./${f}"
+    done
+done
+
+# Generate the things
+(echo '# This file is generated automatically by "bootstrap".' &&
+ echo 'AC_DEFUN([GNULIB_AUTOCONF_SNIPPET],[' &&
+ ../gnulib-b28236b/gnulib-tool --extract-autoconf-snippet $gnulib_modules &&
+ echo '])'
+) > m4/gnulib.m4
+
+(echo '# This file is generated automatically by "bootstrap".' &&
+ ../gnulib-b28236b/gnulib-tool --extract-automake-snippet $gnulib_modules |
+ sed 's/^[	 ]*AM_CPPFLAGS[	 ]*+=/# (commented out by bootstrap) &/'
+) > lib/gnulib.mk