LOCAL_EXPORT_CFLAGS doesn't exist

It's about to exist, but it will be an error to use in normal
Android.mk files.

Test: none, this is a no-op
Change-Id: Id6ed07061a28caf83a54bc06be916446a09b939a
diff --git a/Android.mk b/Android.mk
index a8fefd8..9ccb336 100644
--- a/Android.mk
+++ b/Android.mk
@@ -19,7 +19,6 @@
 
 LOCAL_C_INCLUDES := $(common_C_INCLUDES)
 LOCAL_CFLAGS := $(version_CFLAGS)
-LOCAL_EXPORT_CFLAGS := $(version_CFLAGS)
 LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include $(LOCAL_PATH)/mkfs
 include $(BUILD_STATIC_LIBRARY)
 
@@ -33,7 +32,6 @@
 
 LOCAL_C_INCLUDES := $(common_C_INCLUDES)
 LOCAL_CFLAGS := $(version_CFLAGS)
-LOCAL_EXPORT_CFLAGS := $(version_CFLAGS)
 LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include $(LOCAL_PATH)/mkfs
 include $(BUILD_HOST_STATIC_LIBRARY)
 
@@ -46,7 +44,6 @@
 
 LOCAL_C_INCLUDES := $(common_C_INCLUDES)
 LOCAL_CFLAGS := $(version_CFLAGS)
-LOCAL_EXPORT_CFLAGS := $(version_CFLAGS)
 LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include $(LOCAL_PATH)/mkfs
 LOCAL_STATIC_LIBRARIES := \
      libf2fs_ioutils_host \