Use LOCAL_NDK_STL_VARIANT instead of LOCAL_CXX_STL

When TARGET_BUILD_APPS is set the libz modules switch to building
against the NDK, which requires LOCAL_NDK_STL_VARIANT instead of
LOCAL_CXX_STL.

Bug: 25904002
Change-Id: I05339365d81f2359bcaa415e485490e7a6de09c6
1 file changed