Retire LOCAL_NDK_VERSION.

We are now unifying the NDK versions of unbundled native code to always
use the latest NDK.
We don't need the variable LOCAL_NDK_VERSION now.
To build native code with NDK, you need set just LOCAL_SDK_VERSION.

Bug: 6932421
Change-Id: I86f05a264249cda6bae97b4b1616f03700cd9dfa
diff --git a/core/package.mk b/core/package.mk
index fac9549..7b10c33 100644
--- a/core/package.mk
+++ b/core/package.mk
@@ -299,12 +299,12 @@
 # libstlport_shared.so should never go to the system image.
 # Instead it should be packaged into the apk.
 ifeq (stlport_shared,$(LOCAL_NDK_STL_VARIANT))
-ifndef LOCAL_NDK_VERSION
-$(error LOCAL_NDK_VERSION has to be defined together with LOCAL_NDK_STL_VARIANT, \
+ifndef LOCAL_SDK_VERSION
+$(error LOCAL_SDK_VERSION has to be defined together with LOCAL_NDK_STL_VARIANT, \
     LOCAL_PACKAGE_NAME=$(LOCAL_PACKAGE_NAME))
 endif
 jni_shared_libraries += \
-    $(HISTORICAL_NDK_VERSIONS_ROOT)/$(LOCAL_NDK_VERSION)/sources/cxx-stl/stlport/libs/$(TARGET_CPU_ABI)/libstlport_shared.so
+    $(HISTORICAL_NDK_VERSIONS_ROOT)/current/sources/cxx-stl/stlport/libs/$(TARGET_CPU_ABI)/libstlport_shared.so
 endif
 
 # Set the abi directory used by the local JNI shared libraries.