Merge branch 'jc/maint-fix-test-perm' into maint-1.6.6

* jc/maint-fix-test-perm:
  lib-patch-mode.sh: Fix permission
  t6000lib: Fix permission

t/lib-patch-mode.sh

+: included from t2016 and others
+
 . ./test-lib.sh
 
 if ! test_have_prereq PERL; then

t/t6000lib.sh

+: included from 6002 and others
+
 [ -d .git/refs/tags ] || mkdir -p .git/refs/tags
 
 :> sed.script