build app_process64 on 64-bit targets

On 64-bit platforms builds two copies of app_process, the 32-bit
app_process and 64-bit app_process64.

Change-Id: I59d739b5df398ad0bd040c954c57640ff7ab3e72

cmds/app_process/Android.mk

@@ -1,4 +1,6 @@
 LOCAL_PATH:= $(call my-dir)
+
+# 32-bit app_process
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES:= \
@@ -12,9 +14,29 @@ LOCAL_SHARED_LIBRARIES := \
 	libandroid_runtime
 
 LOCAL_MODULE:= app_process
-
+LOCAL_32_BIT_ONLY := true
 include $(BUILD_EXECUTABLE)
 
+ifeq ($(TARGET_IS_64_BIT),true)
+
+# 64-bit app_process64
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+	app_main.cpp
+
+LOCAL_SHARED_LIBRARIES := \
+	libcutils \
+	libutils \
+	liblog \
+	libbinder \
+	libandroid_runtime
+
+LOCAL_MODULE:= app_process64
+LOCAL_NO_2ND_ARCH := true
+include $(BUILD_EXECUTABLE)
+
+endif # TARGET_IS_64_BIT
 
 # Build a variant of app_process binary linked with ASan runtime.
 # ARM-only at the moment.