Merge branch 'js/windows-tests'

Merge branch 'js/windows-tests'

* js/windows-tests:
  t5602: Work around path mangling on MSYS
  t5300, t5302, t5303: Do not use /dev/zero
  t2200, t7004: Avoid glob pattern that also matches files
  t7300: fix clean up on Windows
  test-lib: Introduce test_chmod and use it instead of update-index --chmod
  test-lib: Simplify test counting.
  test-lib: Replace uses of $(expr ...) by POSIX shell features.
  Call 'say' outside test_expect_success
  test suite: Use 'say' to say something instead of 'test_expect_success'
  t9400, t9401: Do not force hard-linked clone