On windows you must add ".cmd" when calling "ndk-build"

[ianjosephfischer]

See: http://stackoverflow.com/questions/27477158/android-studio-ndk-build-trouble-errorexecution-failed-for-task-appbuildnati

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

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[ianjosephfischer]

I signed it!

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for the commit author(s). If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.

[ianjosephfischer]

Changed CLA's github account name from "ianjosephfischer@gmail.com" to "ianjosephfischer" to attempt to fix the authoring