Add bison 3.8.6

steps/bison-3.8.2/patches/defines-header.patch

@@ -0,0 +1,19 @@
+SPDX-FileCopyrightText: 2025 Samuel Tyler <samuel@samuelt.me>
+
+SPDX-License-Identifier: GPL-3.0-or-later
+
+Change %header to %defines, this was renamed in development cycle for 3.8.
+
+diff --git bison-3.8.2/src/parse-gram.y bison-3.8.2/src/parse-gram.y
+index 96e95ed1..10240483 100644
+--- bison-3.8.2/src/parse-gram.y
++++ bison-3.8.2/src/parse-gram.y
+@@ -152,7 +152,7 @@
+ %define parse.error custom
+ %define parse.lac full
+ %define parse.trace
+-%header
++%defines
+ %expect 0
+ %verbose
+ 

steps/bison-3.8.2/patches/our-bison.patch

@@ -0,0 +1,18 @@
+SPDX-FileCopyrightText: 2021 Samuel Tyler <samuel@samuelt.me>
+
+SPDX-License-Identifier: GPL-3.0-or-later
+
+Why do they insist on using themselves to bootstrap themselves? It doesn't
+exist...
+
+--- bison-3.8.2/Makefile.am	2021-04-15 21:29:36.596205032 +1000
++++ bison-3.8.2/Makefile.am	2021-04-15 21:30:00.367365897 +1000
+@@ -39,7 +39,7 @@
+ ## Running the bison from this tarball.  To generate our own parser,
+ ## but also to run the tests.  Of course, you ought to keep a sane
+ ## version of Bison nearby...
+-BISON = $(top_builddir)/tests/bison
++BISON = /usr/bin/bison
+ BISON_IN = $(top_srcdir)/tests/bison.in
+ YACC = $(BISON) -o y.tab.c
+ AM_YFLAGS_WITH_LINES = --defines -Werror -Wall --report=all

steps/bison-3.8.2/patches/po-files.patch

@@ -0,0 +1,25 @@
+SPDX-FileCopyrightText: 2025 Samuel Tyler <samuel@samuelt.me>
+
+SPDX-License-Identifier: GPL-3.0-or-later
+
+Can't fetch PO files, no network access.
+
+--- gnulib-7818455/gnulib-tool	2025-12-15 21:17:35.808587084 +1100
++++ gnulib-7818455/gnulib-tool	2025-12-15 21:17:55.399588744 +1100
+@@ -5598,16 +5598,6 @@
+       fi
+       func_append added_files "$pobase/POTFILES.in$nl"
+     fi
+-    # Fetch PO files.
+-    TP_URL="https://translationproject.org/latest/"
+-    if $doit; then
+-      echo "Fetching gnulib PO files from $TP_URL"
+-      (cd "$destdir"/$pobase \
+-       && wget --no-verbose --mirror --level=1 -nd -A.po -P . "${TP_URL}gnulib/"
+-      )
+-    else
+-      echo "Fetch gnulib PO files from $TP_URL"
+-    fi
+     # Create po/LINGUAS.
+     if $doit; then
+       func_dest_tmpfilename $pobase/LINGUAS