cleanup and fixes for the new only delete .err's for non -job builds

git-svn-id: http://www.rocklinux.org/svn/rock-linux/trunk@2356 c5f82cb5-29bc-0310-9cd0-bff59a50e3bc

scripts/Build-Target

@@ -75,8 +75,8 @@ pkgloop() {
 		nobrokendeps=""
 	fi
 	if [ "$ROCKCFG_RETRY_BROKEN" -eq 1 -a \
-             "`ls ${build_root}/var/adm/logs/*.err 2> /dev/null`" -a \
-             "x$build_only_this_package" = "x" ] ; then
+	     -z "$build_only_this_job" -a \
+             "`ls ${build_root}/var/adm/logs/*.err 2> /dev/null`" ] ; then
 		echo_header "Removing old error logs ..."
 		for x in ${build_root}/var/adm/logs/*.err ; do
 			echo_status "Removing ${x#$build_root/} ..."