[vino] build: Use AM_DISTCHECK_CONFIGURE_FLAGS

[Bastien Nocera <hadess src gnome org>]

commit b1d968ee362845f6030a69b8b8bac3c925102c25
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Aug 30 12:51:38 2016 +0200

    build: Use AM_DISTCHECK_CONFIGURE_FLAGS
    
    And not DISTCHECK_CONFIGURE_FLAGS, as it is a developer/maintainer
    option, not a user option.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=766330

 Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 155eb49..b22ab6f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,7 +1,7 @@
 ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 SUBDIRS = po
 
-DISTCHECK_CONFIGURE_FLAGS = \
+AM_DISTCHECK_CONFIGURE_FLAGS = \
        --with-avahi \
        --with-secret \
        --with-network-manager \