all: fix openbsd build

Change-Id: I6eaeebc9b6a4d78ce07efe7680ba8f2eff16462f
Reviewed-on: https://plan9port-review.googlesource.com/1230
Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Russ Cox <rsc@google.com>

src/cmd/auxstats/OpenBSD.c

diff --git a/src/cmd/auxstats/OpenBSD.c b/src/cmd/auxstats/OpenBSD.c
index b34f5b1..f800c05 100644
--- a/src/cmd/auxstats/OpenBSD.c
+++ b/src/cmd/auxstats/OpenBSD.c
@@ -3,11 +3,12 @@
 #include <nlist.h>
 #include <sys/types.h>
 #include <sys/param.h>
+#include <sys/sched.h>
 #include <sys/socket.h>
 #include <sys/sysctl.h>
 #include <sys/time.h>
-#include <sys/dkstat.h>
 #include <net/if.h>
+#include <net/if_var.h>
 #include <machine/apmvar.h>
 #include <sys/ioctl.h>
 #include <uvm/uvm_param.h>

src/lib9/dirread.c

diff --git a/src/lib9/dirread.c b/src/lib9/dirread.c
index f977d15..40fbe3c 100644
--- a/src/lib9/dirread.c
+++ b/src/lib9/dirread.c
@@ -25,14 +25,14 @@
 	long off;
 	return getdirentries(fd, (void*)buf, n, &off);
 }
-#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
 static int
 mygetdents(int fd, struct dirent *buf, int n)
 {
 	off_t off;
 	return getdirentries(fd, (void*)buf, n, &off);
 }
-#elif defined(__sun__) || defined(__NetBSD__)
+#elif defined(__sun__) || defined(__NetBSD__) || defined(__OpenBSD__)
 static int
 mygetdents(int fd, struct dirent *buf, int n)
 {