[NFC] Delete unused feature SuppressCXXForeignReferenceTypeInitializers

[j-hui]

Mistakenly added in #85021

[j-hui]

@swift-ci please smoke test

[j-hui]

Not sure why, but Windows fails with this:

[org.swift.sourcekit-lsp:default] default 2025-11-04 05:46:41.5540 +0000

SwiftPM log: [error]: Invalid manifest (compiled with: ["C:\\Users\\swift-ci\\jenkins\\workspace\\swift-PR-windows\\build\\Program Files\\Swift\\Toolchains\\0.0.0+Asserts\\usr\\bin\\swiftc.exe", "-vfsoverlay", "T:\\tmp\\TemporaryDirectory.fwxSYa\\vfs.yaml", "-L", "C:\\Users\\swift-ci\\jenkins\\workspace\\swift-PR-windows\\build\\Program Files\\Swift\\Toolchains\\0.0.0+Asserts\\usr\\lib\\swift\\pm\\ManifestAPI", "-lPackageDescription", "-sdk", "T:\\Program Files\\Swift\\Platforms\\Windows.platform\\Developer\\SDKs\\Windows.sdk", "-libc", "MD", "-I", "T:\\Program Files\\Swift\\Platforms\\Windows.platform\\Developer\\Library\\XCTest-0.0.0\\usr\\lib\\swift\\windows", "-I", "T:\\Program Files\\Swift\\Platforms\\Windows.platform\\Developer\\Library\\XCTest-0.0.0\\usr\\lib\\swift\\windows\\x86_64", "-L", "T:\\Program Files\\Swift\\Platforms\\Windows.platform\\Developer\\Library\\XCTest-0.0.0\\usr\\lib\\swift\\windows\\x86_64", "-I", "T:\\Program Files\\Swift\\Platforms\\Windows.platform\\Developer\\Library\\Testing-0.0.0\\usr\\lib\\swift\\windows", "-L", "T:\\Program Files\\Swift\\Platforms\\Windows.platform\\Developer\\Library\\Testing-0.0.0\\usr\\lib\\swift\\windows\\x86_64", "-use-ld=lld", "-swift-version", "5", "-I", "C:\\Users\\swift-ci\\jenkins\\workspace\\swift-PR-windows\\build\\Program Files\\Swift\\Toolchains\\0.0.0+Asserts\\usr\\lib\\swift\\pm\\ManifestAPI", "-package-description-version", "5.1.0", "C:\\Users\\swift-ci\\jenkins\\workspace\\swift-PR-windows\\build\\tmp\\lsp-test\\B60B6D47\\pkg\\Package.swift", "-o", "T:\\tmp\\TemporaryDirectory.KM8C2c\\pkg-manifest.exe"])

Missing or empty JSON output from manifest compilation for pkg

Gonna try again.

[j-hui]

@swift-ci please smoke test windows platform