xend: Remove a couple of unused function prototypes.

Commit 70f44663 (from 2008) introduced
some functions for testing whether xend was returning correct sound
models.  Those functions have long gone, but the function prototypes
remain.  This commit removes the unused prototypes.
Signed-off-by: NRichard W.M. Jones <rjones@redhat.com>
(cherry picked from commit 093eea95)

src/xen/xend_internal.h

@@ -84,10 +84,6 @@ xenDaemonDomainFetch(virConnectPtr xend,
                      const char *cpus);
 
 
-  int is_sound_model_valid(const char *model);
-  int is_sound_model_conflict(const char *model, const char *soundstr);
-
-
 /* refactored ones */
 int xenDaemonOpen(virConnectPtr conn, virConnectAuthPtr auth,
                   unsigned int flags);