Only run include-signal test on linux

hlopko · hlopko · commit 3ff3ab746f98 · 2021-01-07T12:37:22.000+01:00
diff --git a/test/Interop/C/libc/include-signal.swift b/test/Interop/C/libc/include-signal.swift
@@ -28,4 +28,6 @@
 // See https://forums.swift.org/t/problems-with-swiftglibc-and-proposed-fix/37594
 // for further details.
 
+// REQUIRES: OS=linux-gnu
+
 import IncludeSignal
