Add bison 2.3

This is required for perl 5.10.1.

sysa/bison-2.3/patches/autover-mismatch.patch

@@ -0,0 +1,17 @@
+SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
+
+SPDX-License-Identifier: GPL-2.0-or-later
+
+This macro does not exist in newer versions of autoconf and is unrequired.
+There is no verion of autoconf supporting this project + gnulib + this macro.
+
+--- m4/po_gl.m4	2021-04-11 18:39:53.353069610 +1000
++++ m4/po_gl.m4	2021-04-11 18:40:20.422242498 +1000
+@@ -24,7 +24,6 @@
+ [
+   AC_REQUIRE([AC_PROG_MAKE_SET])dnl
+   AC_REQUIRE([AC_PROG_INSTALL])dnl
+-  AC_REQUIRE([AM_MKINSTALLDIRS])dnl
+   AC_REQUIRE([AM_NLS])dnl
+ 
+   dnl Perform the following tests also if --disable-nls has been given,

sysa/bison-2.3/patches/fopen-safer.patch

@@ -0,0 +1,18 @@
+SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
+
+SPDX-License-Identifier: GPL-2.0-or-later
+
+fopen-safer.c for whatever reason does not exist when added by gnulib.
+
+--- lib/Makefile.am	2021-04-11 19:01:01.265993928 +1000
++++ lib/Makefile.am	2021-04-11 19:01:40.413232722 +1000
+@@ -32,7 +32,8 @@
+ lib_SOURCES = \
+   get-errno.h get-errno.c \
+   subpipe.h subpipe.c \
+-  $(bitsets_sources) $(additional_bitsets_sources) $(timevars_sources)
++  $(bitsets_sources) $(additional_bitsets_sources) $(timevars_sources) \
++  fopen-safer.c
+ 
+ # Implementation of bitsets
+ bitsets_sources = \

sysa/bison-2.3/patches/gnulib-fix.patch

@@ -0,0 +1,17 @@
+SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
+
+SPDX-License-Identifier: GPL-2.0-or-later
+
+This should be declared for gnulib, but for some reason is not, most likely
+use of a different version (but CVS history no longer exists).
+
+--- lib/Makefile.am	2021-04-11 13:49:09.414805465 +1000
++++ lib/Makefile.am	2021-04-11 13:49:26.418916036 +1000
+@@ -19,6 +19,7 @@
+ 
+ BUILT_SOURCES =
+ EXTRA_DIST =
++EXTRA_lib_SOURCES =
+ MOSTLYCLEANFILES =
+ 
+ lib_LIBRARIES = $(YACC_LIBRARY)

sysa/bison-2.3/patches/our-bison.patch

@@ -0,0 +1,20 @@
+SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
+
+SPDX-License-Identifier: GPL-2.0-or-later
+
+This doesn't actually make sense, you can't use the built bison to bootstrap
+itself. Make it use our bison instead.
+
+--- src/Makefile.am	2021-04-10 21:37:11.570390316 +1000
++++ src/Makefile.am	2021-04-10 21:38:01.805804332 +1000
+@@ -23,10 +23,6 @@
+ 
+ LDADD = ../lib/libbison.a $(LIBINTL)
+ 
+-# Use our own Bison to build the parser.  Of course, you ought to
+-# keep a sane version of Bison nearby...
+-YACC = ../tests/bison -y
+-
+ bin_PROGRAMS = bison
+ bin_SCRIPTS = $(YACC_SCRIPT)
+ EXTRA_SCRIPTS = yacc