applypatch: Compile libimgpatch for target and host.

update_engine need it for the new IMGDIFF operation.

Also removed __unused in ApplyImagePatch() as I got error building it
for the host, and I think it's dangerous not checking the size of the
input.

Test: mma
Bug: 26628339

Change-Id: I22d4cd55c2c3f87697d6afdf10e8106fef7d1a9c
diff --git a/applypatch/Android.mk b/applypatch/Android.mk
index 93a2729..3cb8beb 100644
--- a/applypatch/Android.mk
+++ b/applypatch/Android.mk
@@ -20,7 +20,7 @@
 LOCAL_SRC_FILES := applypatch.cpp bspatch.cpp freecache.cpp imgpatch.cpp utils.cpp
 LOCAL_MODULE := libapplypatch
 LOCAL_MODULE_TAGS := eng
-LOCAL_C_INCLUDES += external/bzip2 external/zlib bootable/recovery
+LOCAL_C_INCLUDES += bootable/recovery
 LOCAL_STATIC_LIBRARIES += libbase libmtdutils libmincrypt libbz libz
 
 include $(BUILD_STATIC_LIBRARY)
@@ -28,6 +28,28 @@
 include $(CLEAR_VARS)
 
 LOCAL_CLANG := true
+LOCAL_SRC_FILES := bspatch.cpp imgpatch.cpp utils.cpp
+LOCAL_MODULE := libimgpatch
+LOCAL_C_INCLUDES += bootable/recovery
+LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
+LOCAL_STATIC_LIBRARIES += libmincrypt libbz libz
+
+include $(BUILD_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+
+LOCAL_CLANG := true
+LOCAL_SRC_FILES := bspatch.cpp imgpatch.cpp utils.cpp
+LOCAL_MODULE := libimgpatch
+LOCAL_C_INCLUDES += bootable/recovery
+LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
+LOCAL_STATIC_LIBRARIES += libmincrypt libbz libz
+
+include $(BUILD_HOST_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+
+LOCAL_CLANG := true
 LOCAL_SRC_FILES := main.cpp
 LOCAL_MODULE := applypatch
 LOCAL_C_INCLUDES += bootable/recovery