Sync with v2.16.1

* maint: Git 2.16.1 t5601-clone: test case-conflicting files on case-insensitive filesystem repository: pre-initialize hash algo pointer

Junio C Hamano committed Jan 21, 2018 at 21:14 UTC 59c276cf4da0705064c32c9dba54baefa282ea55

No changes.