test-lib: Make the test_external_* functions TAP-aware

diff --git a/t/lib-patch-mode.sh b/t/lib-patch-mode.sh
old mode 100755 (executable)
new mode 100644 (file)
index 75a3ee2..ce36f34
--- a/t/lib-patch-mode.sh
+++ b/t/lib-patch-mode.sh
@@ -1,3 +1,5 @@
+: included from t2016 and others
+
 . ./test-lib.sh
 
 if ! test_have_prereq PERL; then