lineage: Restore Android.mk based build-manifest.xml build rule

Users don't like the increased delay during `. build/envsetup.sh` or `lunch`...

Change-Id: I1a92a171f2e2ec1ba2453d6c666cefcd9884b39b

.gitignore

@@ -1,4 +1,2 @@
 proprietary/*
 prebuilt/archive
-prebuilt/generated/*
-!prebuilt/generated/Android.bp

build/tools/gen_build-manifest.sh

@@ -1,9 +0,0 @@
-#!/bin/bash -e
-#
-# SPDX-FileCopyrightText: The LineageOS Project
-# SPDX-License-Identifier: Apache-2.0
-#
-
-echo "- Generating vendor/lineage/prebuilt/generated/build-manifest.xml"
-if [ "$MANIFEST_EXCLUDES" ]; then MANIFEST_EXCLUDES="|${MANIFEST_EXCLUDES}"; fi
-python3 .repo/repo/repo manifest -o - -r | grep -Ev "proprietary_${MANIFEST_EXCLUDES}" > vendor/lineage/prebuilt/generated/build-manifest.xml

config/Android.mk

@@ -0,0 +1,33 @@
+# Copyright (C) 2023 The LineageOS Project
+#
+# 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.
+
+ifdef MANIFEST_EXCLUDES
+MANIFEST_EXCLUDES := |$(MANIFEST_EXCLUDES)
+endif
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE         := build-manifest
+LOCAL_MODULE_SUFFIX  := .xml
+LOCAL_MODULE_CLASS   := ETC
+LOCAL_PRODUCT_MODULE := true
+
+_build-manifest_intermediates := $(call intermediates-dir-for,$(LOCAL_MODULE_CLASS),$(LOCAL_MODULE))
+_build-manifest_xml := $(_build-manifest_intermediates)/$(LOCAL_MODULE)$(LOCAL_MODULE_SUFFIX)
+
+$(_build-manifest_xml):
+	mkdir -p $(dir $@)
+	python3 .repo/repo/repo manifest -o - -r | grep -Ev "proprietary_$(MANIFEST_EXCLUDES)" > $@
+
+include $(BUILD_SYSTEM)/base_rules.mk

prebuilt/generated/Android.bp

@@ -1,10 +0,0 @@
-//
-// SPDX-FileCopyrightText: The LineageOS Project
-// SPDX-License-Identifier: Apache-2.0
-//
-
-prebuilt_etc {
-    name: "build-manifest.xml",
-    src: "build-manifest.xml",
-    product_specific: true,
-}