fix spelling of DEBIAN_PRIORITY

The spelling used is for the old version of this variable,
or the one cdebconf uses, but this is in daily-build, when
installing build deps, so that's wrong.

r59416

build/daily-build

@@ -141,9 +141,9 @@ deps () {
 	packages=`echo $temp | sed -e 's%dpkg-checkbuilddeps: Unmet build dependencies: %%'`
 	apt-get update
 	if [ "$packages" ]; then
-		DEBCONF_PRIORITY=critical apt-get -y install $packages
+		DEBIAN_PRIORITY=critical apt-get -y install $packages
 	fi
-	DEBCONF_PRIORITY=critical apt-get -y upgrade
+	DEBIAN_PRIORITY=critical apt-get -y upgrade
 }
 
 usage () {