block: move include files to include/block/

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/qemu-img.c b/qemu-img.c
index a13bc78..2e5ca5c 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -29,7 +29,7 @@
 #include "qemu-error.h"
 #include "osdep.h"
 #include "sysemu.h"
-#include "block_int.h"
+#include "block/block_int.h"
 #include <getopt.h>
 #include <stdio.h>