Temporarily skip macro tests on Amazon Linux

These are failing on the 2023 bootstrap job, skip for now to allow
getting a toolchain out.

Author: bnbarham

Sources/SKTestSupport/SkipUnless.swift

@@ -28,6 +28,7 @@ import ToolchainRegistry
 import XCTest
 
 import struct TSCBasic.AbsolutePath
+import var TSCBasic.localFileSystem
 import class TSCBasic.Process
 import enum TSCBasic.ProcessEnv
 
@@ -129,6 +130,21 @@ package actor SkipUnless {
     try XCTSkipUnless(Platform.current == .windows, message)
   }
 
+  package static func platformIsNotAmazonLinux(_ message: String) throws {
+    if Platform.current != .linux {
+      return
+    }
+
+    let release: String
+    do {
+      release = try localFileSystem.readFileContents(AbsolutePath(validating: "/etc/system-release")).description
+    } catch {
+        return
+    }
+
+    try XCTSkipUnless(!release.hasPrefix("Amazon"), message)
+  }
+
   package static func platformSupportsTaskPriorityElevation() throws {
     #if os(macOS)
     guard #available(macOS 14.0, *) else {
@@ -149,6 +165,7 @@ package actor SkipUnless {
       Platform.current != .windows,
       "Temporarily skipping as we need to fix these tests to use the cmake-built swift-syntax libraries on Windows."
     )
+    try SkipUnless.platformIsNotAmazonLinux("https://github.com/swiftlang/sourcekit-lsp/issues/2350")
 
     return try await shared.skipUnlessSupported(file: file, line: line) {
       do {