cmd: Implement 'echo/'

[Thomas Faller]

This patch implements the 'echo/' functionality as noticed in bug
https://bugs.winehq.org/show_bug.cgi?id=37865

---
  programs/cmd/builtins.c                  |  4 ++--
  programs/cmd/tests/test_builtins.cmd     |  8 ++++++++
  programs/cmd/tests/test_builtins.cmd.exp | 16 ++++++++++++++++
  programs/cmd/wcmdmain.c                  |  7 +++++--
  4 files changed, 31 insertions(+), 4 deletions(-)




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