[vinagre] Use correct compiler warning flags variable

[David King <davidk src gnome org>]

commit 4dd47fea5fcb2f7ed03d2a49304e36170b6237e5
Author: David King <amigadave amigadave com>
Date:   Mon Sep 5 18:18:01 2011 +0200

    Use correct compiler warning flags variable
    
    Additionally, ensure that compiler warnings are set to maximum severity
    during a distcheck.

 Makefile.am |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index b84f314..6c6b90a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,7 +1,9 @@
 ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 SUBDIRS = help po
 
-DISTCHECK_CONFIGURE_FLAGS = --disable-scrollkeeper
+DISTCHECK_CONFIGURE_FLAGS = \
+	--disable-scrollkeeper \
+	--enable-compile-warnings=maximum
 
 common_cppflags = \
 	-I$(top_builddir) \
@@ -17,7 +19,7 @@ common_cppflags = \
 	-DPACKAGE_LOCALE_DIR=\""$(datadir)/locale"\" \
 	-DSSH_PROGRAM=\"$(SSH_PROGRAM)\" \
 	$(VINAGRE_CFLAGS) \
-	$(WARN_FLAGS) \
+	$(WARN_CFLAGS) \
 	$(DISABLE_DEPRECATED)
 
 AM_CPPFLAGS = \