fix bash syntax for old bashes like on SLES 9 again

diff --git a/init_buildsystem b/init_buildsystem
index 918f3e1..fbfbac6 100755 (executable)
--- a/init_buildsystem
+++ b/init_buildsystem
@@ -256,10 +256,10 @@ maybe_add_all_zypp_repos()
        if [ "$i" = "zypp://" ]; then
            for j in `grep -l enabled=1 /etc/zypp/repos.d/*.repo`; do
                j="${j#/etc/zypp/repos.d/}"
-               r+=("zypp://${j%.repo}")
+               r=("${r[@]}" "zypp://${j%.repo}")
            done
        else
-           r+=("$i")
+           r=("${r[@]}" "$i")
        fi
     done
     repos=("${r[@]}")