libidn2: add replay script (#13481)

libidn2: Compile times: Vanilla=170; Replay=3;

Signed-off-by: David Korczynski <david@adalogics.com>

Author: DavidKorczynski

projects/libidn2/Dockerfile

@@ -20,4 +20,4 @@ RUN apt-get update && apt-get install -y make autoconf automake gettext libtool
 RUN git clone --recursive https://gitlab.com/libidn/libidn2.git
 
 WORKDIR libidn2
-COPY build.sh $SRC/
+COPY build.sh replay_build.sh $SRC/

projects/libidn2/replay_build.sh

@@ -0,0 +1,27 @@
+#!/bin/bash -eu
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+# This script is useful for OSS-Fuzz infrastructure which is used to rebuild
+# code from cached images. This is to support various ongoing efforts in
+# OSS-Fuzz.
+
+cd $SRC/libidn2
+make -j$(nproc)
+
+cd fuzz
+make oss-fuzz
+find . -name '*_fuzzer' -exec cp -v '{}' $OUT ';'