Add basic VNDK support in Make

Add BOARD_VNDK_VERSION and LOCAL_USE_VNDK to specify the version of the
VNDK that will be used globally, and whether to use the VNDK on a module
basis.

If the board is using the VNDK:

* LOCAL_COPY_HEADERS may only be used by modules defining LOCAL_USE_VNDK
* LOCAL_USE_VNDK modules will compile against the NDK headers and stub
  libraries, but continue to use the platform libc++.
* LOCAL_USE_VNDK modules will not have the global includes like
  system/core/include, but it will use device-specific kernel headers.

This change does not attempt to enforce any linking constraints, that
will come in a later patch.

Test: out/build-aosp_arm.ninja is identical before/after
Change-Id: Icce65d4974f085093d500b5b2516983788fe2905
diff --git a/core/config.mk b/core/config.mk
index 2fcf1fe..a4b0cea 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -687,7 +687,7 @@
 HOST_PROJECT_INCLUDES :=
 HOST_PROJECT_SYSTEM_INCLUDES := $(HOST_OUT_HEADERS)
 TARGET_PROJECT_INCLUDES :=
-TARGET_PROJECT_SYSTEM_INCLUDES := $(TARGET_OUT_HEADERS) \
+TARGET_PROJECT_SYSTEM_INCLUDES := \
 		$(TARGET_DEVICE_KERNEL_HEADERS) $(TARGET_BOARD_KERNEL_HEADERS) \
 		$(TARGET_PRODUCT_KERNEL_HEADERS)