Fix some gcc-4.4-isms, should build now on 4.1+.

src/rt/rust_kernel.cpp

@@ -3,11 +3,12 @@
 #define __STDC_LIMIT_MACROS 1
 #endif
 
-#include <vector>
 #include "rust_internal.h"
 #include "rust_util.h"
 #include "rust_scheduler.h"
 
+#include <vector>
+
 #define KLOG_(...)                              \
     KLOG(this, kern, __VA_ARGS__)
 #define KLOG_ERR_(field, ...)                   \