patch 8.1.1529: libcanberra is linked with even when not used

Problem:    Libcanberra is linked with even when not used.
Solution:   Have configure check for libcanberra only when wanted.
            (suggestions by Libor Bukata)

src/version.c

@@ -777,6 +777,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1529,
 /**/
     1528,
 /**/