patch 8.1.1502: cannot play any sound

Problem:    Cannot play any sound.
Solution:   Use libcanberra if available.  Add sound functions.
diff --git a/src/config.h.in b/src/config.h.in
index 23e301c..c1ced6f 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -207,6 +207,7 @@
 #undef HAVE_STRNICMP
 #undef HAVE_STRPBRK
 #undef HAVE_STRTOL
+#undef HAVE_CANBERRA
 #undef HAVE_ST_BLKSIZE
 #undef HAVE_SYSCONF
 #undef HAVE_SYSCTL