stand: Don't need sys/select.h

The boot loader doesn't need the types and prototypes defined in
sys/select.h, so don't indirectly include it.

Sponsored by:		Netflix

sys/sys/time.h

@@ -611,7 +611,9 @@ int	tvtohz(struct timeval *tv);
 #include <time.h>
 
 #include <sys/cdefs.h>
+#ifndef _STANDALONE
 #include <sys/select.h>
+#endif
 
 __BEGIN_DECLS
 int	setitimer(int, const struct itimerval *, struct itimerval *);

sys/sys/types.h

@@ -311,7 +311,9 @@ typedef	_Bool	bool;
 
 #if __BSD_VISIBLE
 
+#ifndef _STANDALONE
 #include <sys/select.h>
+#endif
 
 /*
  * The major and minor numbers are encoded in dev_t as MMMmmmMm (where