Add Build type check before using NDK.

Setting the LOCAL_SDK_VERSION will force the module to use prebuilt
libraries which ship as part of the ndk and are found at
prebuilts/ndk/current/platforms/android-$(LOCAL_SDK_VERSION)

We should only use the ndk prebuilts for unbundled build types,
i.e when TARGET_BUILD_APPS is not empty

Change-Id: I9014fd25fe358ea4454718f05213950e2c77bad8
1 file changed