meson: Move all code generation scripts to utils/codegen/

We have multiple code generation scripts in utils/, mixed with other
miscellaneous utilities, as well as a larger code base based on mojom in
utils/ipc/. To make code sharing easier between the generator scripts,
without creating a mess in the utils/ directory, move all the code
generation code to utils/codegen/.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

utils/codegen/gen-header.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+src_dir="$1"
+dst_file="$2"
+
+cat <<EOF > "$dst_file"
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/* This file is auto-generated, do not edit! */
+/*
+ * Copyright (C) 2018-2019, Google Inc.
+ *
+ * libcamera public API
+ */
+
+#pragma once
+
+EOF
+
+headers=$(for header in "$src_dir"/*.h "$src_dir"/*.h.in ; do
+	header=$(basename "$header")
+	header="${header%.in}"
+	echo "$header"
+done | sort)
+
+for header in $headers ; do
+	echo "#include <libcamera/$header>" >> "$dst_file"
+done