Replace bison 3.4.2 with bison 3.6.4

steps/bison-3.6.4/pass1.sh

@@ -0,0 +1,47 @@
+# SPDX-FileCopyrightText: 2021-22 Samuel Tyler <samuel@samuelt.me>
+# SPDX-FileCopyrightText: 2022 Andrius Štikonas <andrius@stikonas.eu>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+src_prepare() {
+    default
+
+    # GRAM_error was added after Bison 3.4, and doesn't add anything
+    # other than some sanity checks.
+    sed -i '/GRAM_error/d' src/scan-gram.l
+
+    # Remove pre-generated flex/bison files
+    rm src/parse-gram.c src/parse-gram.h
+    rm src/scan-code.c
+    rm src/scan-gram.c
+    rm src/scan-skel.c
+
+    # Remove pregenerated info files
+    rm doc/bison.info*
+
+    # Remove gettext files
+    rm runtime-po/*.gmo
+
+    ../../import-gnulib.sh
+
+    # pregenerated gperf files
+    for f in lib/iconv_open-*.gperf; do
+        touch "$(basename "$f" .gperf).h"
+    done
+
+    AUTOPOINT=true AUTOMAKE=automake-1.15 ACLOCAL=aclocal-1.15 autoreconf-2.69 -fi
+}
+
+src_configure() {
+    ./configure --prefix="${PREFIX}" \
+        --libdir="${LIBDIR}" \
+        --disable-nls
+}
+
+src_compile() {
+    make -j1 MAKEINFO=true
+}
+
+src_install() {
+    make MAKEINFO=true DESTDIR="${DESTDIR}" install
+}