zlib.h is an external header

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1077 c046a42c-6fe2-441c-8c8c-71466251a162

block-qcow.c

@@ -23,7 +23,7 @@
  */
 #include "vl.h"
 #include "block_int.h"
-#include "zlib.h"
+#include <zlib.h>
 #include "aes.h"
 
 /**************************************************************/