[UE4.7.0 Bug] Deploying to Nexus 9: ERROR: Unknown NDK architecture 'arm64-v8a'

Is this OK.

switch (UE4Arch)
{
case “-armv7”: return “armeabi-v7a”;
case “arm64-v8a”: return “-arm64”;
case “-x86”: return “x86”;

I would still like the armv 7 option.
Is they anyway to do a build on the source without doing the whole file again? I tried rebuild it is still taking forever.