Remove commented-out code pt. 2

Author: jrflat

Sources/System/Internals/Constants.swift

@@ -663,12 +663,6 @@ internal var _AT_SYMLINK_NOFOLLOW_ANY: CInt { AT_SYMLINK_NOFOLLOW_ANY }
 internal var _AT_RESOLVE_BENEATH: CInt { AT_RESOLVE_BENEATH }
 #endif
 
-// TODO: Re-enable when _GNU_SOURCE can be defined.
-//#if os(FreeBSD) || os(Linux) || os(Android)
-//@_alwaysEmitIntoClient
-//internal var _AT_EMPTY_PATH: CInt { AT_EMPTY_PATH }
-//#endif
-
 // MARK: - File Mode / File Type
 
 @_alwaysEmitIntoClient

Tests/SystemTests/StatTests.swift

@@ -400,13 +400,6 @@ private struct StatTests {
 
 }
 
-// TODO: Re-enable for testing when _GNU_SOURCE can be defined.
-//#if !SYSTEM_PACKAGE_DARWIN && !os(WASI)
-//private extension FileDescriptor.OpenOptions {
-//  static var path: Self { Self(rawValue: O_PATH) }
-//}
-//#endif
-
 // Comparison operators for timespec until UTCClock.Instant properties are available
 private func >= (lhs: timespec, rhs: timespec) -> Bool {
   (lhs.tv_sec, lhs.tv_nsec) >= (rhs.tv_sec, rhs.tv_nsec)