[libdmapsharing/LIBDMAPSHARING_3_0] configure.ac: restore support for silent builds

[W. Michael Petullo <wmpetullo src gnome org>]

commit 56531091f2ffe35b531386985651ce427548158d
Author: W. Michael Petullo <mike flyn org>
Date:   Sun Jul 5 20:35:37 2020 -0500

    configure.ac: restore support for silent builds

 configure.ac | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/configure.ac b/configure.ac
index bc550e2..2efaebe 100644
--- a/configure.ac
+++ b/configure.ac
@@ -326,6 +326,9 @@ AM_CONDITIONAL(USE_DNS_SD, test "x$USE_DNS_SD" = "xyes")
 AC_SUBST(MDNS_CFLAGS)
 AC_SUBST(MDNS_LIBS)
 
+# Enable silent build when available (Automake 1.11)
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+
 AM_INIT_AUTOMAKE
 
 AC_CONFIG_FILES([