Platform: add sys_xattr module for Android

[compnerd]

This module was left out from the modulariation pass. The declarations here are required for building swift-foundation for Android.

[compnerd]

@swift-ci please test

[hyp]

@compnerd could you also include it from SwiftAndroidNDK.h?

[compnerd]

Sure, though could you explain why that is needed?

[compnerd]

@swift-ci please test

[finagolfin]

I haven't tried building the new swift-foundation lately, but I will apply this NDK header addition natively on Android and test to make sure it doesn't break anything.

[compnerd]

I've tested the android build locally, and this is needed to make progress on the swift-foundation builds for Android. Additionally, the introduced module is an explicit module which was previously not included, so I do not expect this to cause any regressions.

[finagolfin]

I don't either, just running the compiler validation suite with it natively on Android now.

[finagolfin]

Alright, ran the full compiler validation suite natively on Android with this pull and am building a full trunk toolchain with it now, don't see any issues.

[compnerd]

Okay, would be nice to merge this for now. We can address any issues subsequently. Hopefully we can get to the point where we can get swift-foundation android builds via cross-compilation in CI as well. Or would you rather report back quickly @finagolfin?

[finagolfin]

Okay, would be nice to merge this for now. We can address any issues subsequently.

If you need it to build swift-foundation, seems fine to me.

Hopefully we can get to the point where we can get swift-foundation android builds via cross-compilation in CI as well. Or would you rather report back quickly @finagolfin?

I don't understand: what do you want me to report back about?

[compnerd]

Oh, I thought you were doing more tests. Going to merge!