android-ndk r10b

Previously the formula produced wrong directory structure. I've fixed it to be the same as when performing the following commands:
```
tar xf android-ndk32-r10b-darwin-x86_64.tar.bz2
tar xf android-ndk64-r10b-darwin-x86_64.tar.bz2
```
I've changed ndk32 to be unpacked first because it's the main one. But the end result should be the same.