tests/test-diff-copy-depth.out

tests: Windows compatibility fixes

- printenv.py, md5sum.py, simplemerge, test-archive, test-merge1,
  test-merge-symlinks: set standard streams to binary mode
- test-encode: replace "gunzip" by "gzip -d"
- test-hup: requires fifo

-- With aaa
Status:
A somename
  other-file

Diff:
diff --git a/other-file b/somename
copy from other-file
copy to somename

-- With zzz
Status:
A somename
  other-file

Diff:
diff --git a/other-file b/somename
copy from other-file
copy to somename