re-enable 64-bit timestamps on 32-bit platforms

[lhoward]

currently swift-target-tune.bbclass disables 64-bit timestamp support on 32-bit platforms such as armv7 (the default), whilst we await some common Swift packages such as SwiftNIO to also support this. This is an ABI issue which could cause an application to crash.

Tracking PRs:

• Support for 64-bit timespec seconds on 32-bit platforms apple/swift-nio#3277
• build with 64-bit time_t on 32-bit platforms swiftlang/swift#82595
• Support for building with 64-bit time_t/off_t on 32-bit platforms swiftlang/swift-foundation#1395
• 6.1: Support for building with 64-bit time_t/off_t on 32-bit platforms swiftlang/swift-foundation#1388 [6.1]
• build with 64-bit time_t on 32-bit platforms swiftlang/swift-corelibs-foundation#5231
• 6.1: build with 64-bit time_t on 32-bit platforms swiftlang/swift-corelibs-foundation#5228 [6.1]
• order limits.h before stdlib.h to workaround for glibc _FORTIFY_SOURCE swiftlang/swift-testing#1184

[lhoward]

SwiftNIO 2.84.0 has this change. @xtremekforever can you validate?

[xtremekforever]

@lhoward looks like Swift NIO 2.84.0 compiles just fine with the 64-bit time now! Congrats! So all that's missing is the small patch to c_nio_llhttp.h to fix the illegal header include and it'll compile with .Cxx mode enabled as well!

I think we could look at re-enabling 64-bit time in meta-swift again that we have NIO updated. You already include the other patches for Foundation and Swift in the layer, so now that NIO works correctly with it we're good to go!

[lhoward]

Great, I’ll create PRs for both issues.