Remove old os.h code

src/os.h

@@ -1,19 +0,0 @@
-#ifndef _OS_H_
-#define _OS_H_
-
-#if __linux__ || __NetBSD__ || __FreBSD__ || __OpenBSD__ || __Darwin__ || __MacOSX__
-#define HAVE_SQUEUE 1
-#else
-#define HAVE_SQUEUE 0
-#endif
-
-#if HAVE_SQUEUE
-
-#include "squeue/squeue.h"
-extern int qmode;
-extern struct squeue_t *p;
-
-#endif
-
-#endif
-