t/test-lib-functions.sh: avoid "test <cond> -a/-o <cond>"

diff --git a/RelNotes b/RelNotes
index 1efc120fe0bdb1a207a1e93ba97c0a082fd32d78..bf760914010786c830233effc8b96ddacfb114fd 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.8.5.2.txt
\ No newline at end of file
+Documentation/RelNotes/2.1.0.txt
\ No newline at end of file