Fix compile errors when lwIP is absent

2ada02f9 · Silas Boyd-Wickizer · 0c380176 · 2ada02f9
--- a/net.c
+++ b/net.c
@@ -14,6 +14,8 @@
 #include "types.h"
 #include "kernel.h"
 #include "queue.h"
+#include "spinlock.h"
+#include "condvar.h"
 #include "proc.h"
 #include "fs.h"
 #include "file.h"