Restore applypatch/updater/edify for non-A/B OTA support

Google deleted this source from bootable/recovery outright (commit c7ebad5f,
"rm -rf non-AB code", 2024-04-05) — confirmed present at android-14, absent
at android-16.0.0_r4. The runtime side (install.cpp's SetUpNonAbUpdateCommands)
and build-side packaging (ota_from_target_files.py's GenerateNonAbOtaPackage)
both survived; only the source that builds the update-binary executable
itself was removed. Sourced from TeamWin's android_bootable_recovery
(android-14.1), the only living copy found, with install/ZipUtil.cpp,
get_args.cpp, and set_metadata.cpp intentionally left out (only wired into
TeamWin's modified install.cpp, which PawletOS isn't adopting — twrpinstall
carries its own independent copies).

Kept as its own repo, not folded into a recovery fork, so it's buildable
independent of whichever recovery UI ends up in use.

updater/Android.mk

@@ -0,0 +1,123 @@
+# Copyright 2009 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.
+
+LOCAL_PATH := $(call my-dir)
+
+ifneq ($(wildcard external/e2fsprogs/misc/tune2fs.h),)
+    tune2fs_static_libraries := \
+        libext2_com_err \
+        libext2_blkid \
+        libext2_quota \
+        libext2_uuid \
+        libext2_e2p \
+        libext2fs
+    LOCAL_CFLAGS += -DHAVE_LIBTUNE2FS
+else
+    tune2fs_static_libraries :=
+endif
+
+updater_common_static_libraries := \
+    libapplypatch \
+    libbootloader_message \
+    libbspatch \
+    libedify \
+    libotautil \
+    libext4_utils \
+    libdm \
+    libfec \
+    libfec_rs \
+    libavb \
+    libverity_tree \
+    liblog \
+    liblp \
+    libselinux \
+    libsparse \
+    libsquashfs_utils \
+    libbrotli \
+    libbz \
+    libziparchive \
+    libz \
+    libbase \
+    libcrypto_static \
+    libcrypto_utils \
+    libcutils \
+    libutils
+
+
+# Each library in TARGET_RECOVERY_UPDATER_LIBS should have a function
+# named "Register_<libname>()".  Here we emit a little C function that
+# gets #included by updater.cpp.  It calls all those registration
+# functions.
+# $(1): the path to the register.inc file
+# $(2): a list of TARGET_RECOVERY_UPDATER_LIBS
+define generate-register-inc
+    $(hide) mkdir -p $(dir $(1))
+    $(hide) echo "" > $(1)
+    $(hide) $(foreach lib,$(2),echo "extern void Register_$(lib)(void);" >> $(1);)
+    $(hide) echo "void RegisterDeviceExtensions() {" >> $(1)
+    $(hide) $(foreach lib,$(2),echo "  Register_$(lib)();" >> $(1);)
+    $(hide) echo "}" >> $(1)
+endef
+
+
+# updater (static executable)
+# ===============================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := updater
+LOCAL_LICENSE_KINDS := SPDX-license-identifier-Apache-2.0
+LOCAL_LICENSE_CONDITIONS := notice
+LOCAL_NOTICE_FILE := $(LOCAL_PATH)/../NOTICE
+
+LOCAL_SRC_FILES := \
+    updater_main.cpp
+
+LOCAL_C_INCLUDES := \
+    $(LOCAL_PATH)/include
+
+LOCAL_CFLAGS := \
+    -Wall \
+    -Werror
+
+LOCAL_STATIC_LIBRARIES := \
+    libupdater_device \
+    libupdater_core \
+    $(TARGET_RECOVERY_UPDATER_LIBS) \
+    $(TARGET_RECOVERY_UPDATER_EXTRA_LIBS) \
+    $(updater_common_static_libraries) \
+    libfs_mgr \
+    libtune2fs \
+    $(tune2fs_static_libraries)
+
+LOCAL_HEADER_LIBRARIES := libgtest_prod_headers
+
+LOCAL_MODULE_CLASS := EXECUTABLES
+inc := $(call local-generated-sources-dir)/register.inc
+
+# Devices can also add libraries to TARGET_RECOVERY_UPDATER_EXTRA_LIBS.
+# These libs are also linked in with updater, but we don't try to call
+# any sort of registration function for these.  Use this variable for
+# any subsidiary static libraries required for your registered
+# extension libs.
+$(inc) : libs := $(TARGET_RECOVERY_UPDATER_LIBS)
+$(inc) :
+	$(call generate-register-inc,$@,$(libs))
+
+LOCAL_GENERATED_SOURCES := $(inc)
+
+inc :=
+
+LOCAL_FORCE_STATIC_EXECUTABLE := true
+
+include $(BUILD_EXECUTABLE)