Allow using ld_classic if requested

[agocke]

It looks like there's a small bug in our targets that doesn't allow directly enabling ld_classic through an msbuild property if the XCode version is > 15.

[Copilot]

Pull Request Overview

This PR fixes a bug in the MSBuild targets that prevented manual enablement of the ld_classic linker when using Xcode versions greater than 15. The fix allows users to explicitly set the UseLdClassicXCodeLinker property to true to force the use of ld_classic regardless of Xcode version.

• Modifies the condition for adding the -ld_classic linker argument to respect explicit user configuration
• Maintains backward compatibility by preserving the automatic behavior for Xcode 15

[MichalStrehovsky]

Should we instead extend the xcode version check? If I understand this correctly, we default to ld_classic on xcode 15 (with an opt out) because that version has problem. We now know xcode 16 also has problems. Should we just default to ld_classic too?

[agocke]

Should we just default to ld_classic too?

I've taken this advice and included 16 in the version check. I believe 26 actually fixes many of the bugs we're seeing in 16.

[agocke]

/ba-g dead letter