Move fontchain_lint to build/core/tasks

Because `system.img` is a dependency of `fontchain_lint`, and
`system.img` is currently not generated inside `Soong`, it is not
possible to directly convert `fontchain_lint` to `Android.bp`.
Move it to build/core/task first.

Bug: 319050958
Test: m fontchain_lint
Change-Id: I2c318f6f51107cd80f0c70531e23f73569b0ec83

core/tasks/fontchain_lint.mk

@@ -0,0 +1,43 @@
+# Copyright (C) 2011 The Android Open Source 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.
+
+# Run sanity tests on fonts on checkbuild
+checkbuild: fontchain_lint
+
+FONTCHAIN_LINTER := $(HOST_OUT_EXECUTABLES)/fontchain_linter
+ifeq ($(MINIMAL_FONT_FOOTPRINT),true)
+CHECK_EMOJI := false
+else
+CHECK_EMOJI := true
+endif
+
+fontchain_lint_timestamp := $(call intermediates-dir-for,PACKAGING,fontchain_lint)/stamp
+
+.PHONY: fontchain_lint
+fontchain_lint: $(fontchain_lint_timestamp)
+
+fontchain_lint_deps := \
+    external/unicode/DerivedAge.txt \
+    external/unicode/emoji-data.txt \
+    external/unicode/emoji-sequences.txt \
+    external/unicode/emoji-variation-sequences.txt \
+    external/unicode/emoji-zwj-sequences.txt \
+    external/unicode/additions/emoji-data.txt \
+    external/unicode/additions/emoji-sequences.txt \
+    external/unicode/additions/emoji-zwj-sequences.txt \
+
+$(fontchain_lint_timestamp): $(FONTCHAIN_LINTER) $(TARGET_OUT)/etc/fonts.xml $(PRODUCT_OUT)/system.img $(fontchain_lint_deps)
+	@echo Running fontchain lint
+	$(FONTCHAIN_LINTER) $(TARGET_OUT) $(CHECK_EMOJI) external/unicode
+	touch $@