[gnome-nibbles] Switch to AM_DISTCHECK_CONFIGURE_FLAGS

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 789510e083bc7d72955d31ad488f960614ad8955
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Fri Feb 12 19:56:25 2016 -0600

    Switch to AM_DISTCHECK_CONFIGURE_FLAGS
    
    DISTCHECK_CONFIGURE_FLAGS is for the user, not to be overridden here.

 data/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/Makefile.am b/data/Makefile.am
index fcd2d3c..8106524 100644
--- a/data/Makefile.am
+++ b/data/Makefile.am
@@ -44,6 +44,6 @@ CLEANFILES = \
        $(appstream_XML) \
        $(desktop_DATA)
 
-DISTCHECK_CONFIGURE_FLAGS == --enable-appdata-check
+AM_DISTCHECK_CONFIGURE_FLAGS == --enable-appdata-check
 
 -include $(top_srcdir)/git.mk