[Test] Don't run protocol_conformance_collision.swift against older runtimes.

mikeash · mikeash · commit 6638fd06fab7 · 2021-01-12T15:01:58.000-05:00
rdar://72856188 (cherry picked from commit 47df40d)
diff --git a/test/Runtime/protocol_conformance_collision.swift b/test/Runtime/protocol_conformance_collision.swift
@@ -14,6 +14,8 @@
 // UNSUPPORTED: DARWIN_SIMULATOR=tvos
 // UNSUPPORTED: DARWIN_SIMULATOR=watchos
 
+// UNSUPPORTED: use_os_stdlib
+
 import Accelerate
 import Foundation
 import StdlibUnittest
