Merge branch 'zj/diff-empty-chmod'

"git diff --stat" used to fully count a binary file with modified execution bits whose contents is unmodified, which was not right. By Zbigniew Jędrzejewski-Szmek (4) and Johannes Sixt (1) * zj/diff-empty-chmod: t4006: Windows do not have /dev/zero diff --stat: do not run diff on indentical files diff --stat: report mode-only changes for binary files like text files tests: check --[short]stat output after chmod test: modernize style of t4006 Conflicts: diff.c