introduce owner concept in send_queue

In order to be able to distinguish between user-created entries and
library-internal entries, we mark each entry who it belongs to.
This allows then later to let the user manage only the queue entries
that were created by them.

Signed-off-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>

src/rand.c

@@ -32,7 +32,7 @@
 #endif
 #endif
 
-#include "common.h"  /* xmpp_alloc, xmpp_free */
+#include "common.h"  /* strophe_alloc, strophe_free */
 #include "ostypes.h" /* uint8_t, uint32_t, size_t */
 
 #ifndef USE_GETRANDOM