Stop using LOCAL_COPY_HEADERS in expat.

I've cleaned up all the references to libexpat/ in the tree.

Change-Id: Ibd37cf17d5c3b63cb5006d4700e0a10acbf39560
diff --git a/Android.mk b/Android.mk
index a188a24..cfe825c 100644
--- a/Android.mk
+++ b/Android.mk
@@ -18,11 +18,6 @@
 common_C_INCLUDES += \
 	$(LOCAL_PATH)/lib
 
-common_COPY_HEADERS_TO := libexpat
-common_COPY_HEADERS := \
-	lib/expat.h \
-	lib/expat_external.h
-
 # For the host
 # =====================================================
 
@@ -58,8 +53,6 @@
 LOCAL_MODULE:= libexpat-host
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 LOCAL_MODULE_TAGS := optional
-LOCAL_COPY_HEADERS_TO := $(common_COPY_HEADERS_TO)
-LOCAL_COPY_HEADERS := $(common_COPY_HEADERS)
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/lib
 LOCAL_MULTILIB := both
 
@@ -106,8 +99,6 @@
 LOCAL_MODULE:= libexpat
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 LOCAL_MODULE_TAGS := optional
-LOCAL_COPY_HEADERS_TO := $(common_COPY_HEADERS_TO)
-LOCAL_COPY_HEADERS := $(common_COPY_HEADERS)
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/lib
 
 include $(BUILD_SHARED_LIBRARY)