win32: do not use all cpu time


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@709 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/vl.c b/vl.c
index 1e1b5e3..84e8698 100644
--- a/vl.c
+++ b/vl.c
@@ -1529,7 +1529,11 @@
             timeout = 10;
         }
 
-#ifndef _WIN32
+#ifdef _WIN32
+        if (timeout > 0)
+            Sleep(timeout);
+#else
+
         /* poll any events */
         /* XXX: separate device handlers from system ones */
         pf = ufds;