Merge branch 'po/hash-object-size-t'

Support for hashing loose or packed objects larger than 4GB on Windows and other LLP64 platforms has been improved by converting object header buffers and data-handling functions from 'unsigned long' to 'size_t'. * po/hash-object-size-t: hash-object: add a >4GB/LLP64 test case using filtered input hash-object: add another >4GB/LLP64 test case hash-object --stdin: verify that it works with >4GB/LLP64 hash algorithms: use size_t for section lengths object-file.c: use size_t for header lengths hash-object: demonstrate a >4GB/LLP64 problem