vhdx: Use QEMU UUID API

This removes our dependency to libuuid, so that the driver can always be
built.

Similar to how we handled data plane configure options, --enable-vhdx
and --disable-vhdx are also changed to a nop with a message saying it's
obsolete.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Message-Id: <1474432046-325-4-git-send-email-famz@redhat.com>
diff --git a/block/vhdx.c b/block/vhdx.c
index 75ef2b1..0ba2f0a 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -25,8 +25,7 @@
 #include "qemu/bswap.h"
 #include "block/vhdx.h"
 #include "migration/migration.h"
-
-#include <uuid/uuid.h>
+#include "qemu/uuid.h"
 
 /* Options for VHDX creation */
 
@@ -213,11 +212,11 @@
  */
 void vhdx_guid_generate(MSGUID *guid)
 {
-    uuid_t uuid;
+    QemuUUID uuid;
     assert(guid != NULL);
 
-    uuid_generate(uuid);
-    memcpy(guid, uuid, sizeof(MSGUID));
+    qemu_uuid_generate(&uuid);
+    memcpy(guid, &uuid, sizeof(MSGUID));
 }
 
 /* Check for region overlaps inside the VHDX image */