Fixed concurrency issue

Fixed broken thread policy causing deadlocks.

core/thread/thread_unix.odin

@@ -78,7 +78,7 @@ _create :: proc(procedure: Thread_Proc, priority: Thread_Priority) -> ^Thread {
 
 	// NOTE(tetra, 2019-11-01): These only fail if their argument is invalid.
 	assert(unix.pthread_attr_setdetachstate(&attrs, unix.PTHREAD_CREATE_JOINABLE) == 0)
-	when ODIN_OS != .Haiku {
+	when ODIN_OS != .Haiku && ODIN_OS != .NetBSD {
 		assert(unix.pthread_attr_setinheritsched(&attrs, unix.PTHREAD_EXPLICIT_SCHED) == 0)
 	}
 
@@ -91,7 +91,7 @@ _create :: proc(procedure: Thread_Proc, priority: Thread_Priority) -> ^Thread {
 	// Set thread priority.
 	policy: i32
 	res: i32
-	when ODIN_OS != .Haiku {
+	when ODIN_OS != .Haiku && ODIN_OS != .NetBSD {
 		res = unix.pthread_attr_getschedpolicy(&attrs, &policy)
 		assert(res == 0)
 	}