block: move include files to include/block/

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/block/rbd.c b/block/rbd.c
index 737bab1..8def2f1 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -15,7 +15,7 @@
 
 #include "qemu-common.h"
 #include "qemu-error.h"
-#include "block_int.h"
+#include "block/block_int.h"
 
 #include <rbd/librbd.h>