[OpenMP] Enable the affinity tests on FreeBSD, NetBSD and DragonFly (#85500)

FreeBSD, NetBSD and DragonFly also have affinity support. So enable the tests there as well.

GitOrigin-RevId: c7de4a39d5673b91189395f85ca6f71b1eeb115c
diff --git a/runtime/test/lit.cfg b/runtime/test/lit.cfg
index 4a457f4..a345606 100644
--- a/runtime/test/lit.cfg
+++ b/runtime/test/lit.cfg
@@ -129,7 +129,7 @@
 if config.operating_system == 'Darwin':
     config.available_features.add("darwin")
 
-if config.operating_system in ['Linux', 'Windows']:
+if config.operating_system in ['Windows', 'Linux', 'FreeBSD', 'NetBSD', 'DragonFly']:
     config.available_features.add('affinity')
 
 if config.operating_system in ['Linux']: