Added DepthAI and bumped API to 24

[themarpe]

This contains a couple of parts to get everything in place:

• Fixes: cmake-example build fails #790
• Fixes chaquopy-libcxx build on newer NDK
• Bumps API to 24 and update NDK to r26, due to __emutls_get_address issue (Note, might be possible to just recompile with newer NDK, not tested) - In that case, AFAIK libc++ should still be recompiled.
• Adds DepthAI wheel

Let me know on any comments

[mhsmith]

What is the __emutls_get_address issue? I assume you got some error messages, in which case please post them here, and explain how to reproduce them.

[themarpe]

@mhsmith

arthenica/ffmpeg-kit#292

As above - I unfortunately do not have the original message at the moment.

To reproduce:

• NDK r26
• Utilize existing libcxx whl
• Compile DAI as wheel
• Load up the app utilizing the DAI wheel: https://github.com/luxonis/depthai-android-chaquopy-example

I think it primarily boils down to this change: android/ndk#1639
Just swapping out the libcxx whl with a recompiled one was okay and resolved the issue

Previous libc++_shared being compiled with <r23 and my current changes utilizing r26.
I think it could go 2 ways:

• Bump all packages to newer NDK and recompile
• Try to see if DAI can be compiled with r21 (same as at the moment)

[mhsmith]

Replaced by #1059.