[resubmit] cmd: Fix cmd's mishandling of quote-enclosed command strings

[Wilbert Ho]

cmd mishandles quote-enclosed command strings because the leading
quote is included in the string when wine searches through the
built-in commands (dir is a builtin, but "dir is not).

$ ./wine cmd.exe /c "dir README"
wine: cannot find L"C:\\windows\\system32\\dir.exe"
File not found

To fix this, offset the string being compared to the array of builtins
by the number of leading quotes before doing the comparison.

---
 programs/cmd/tests/test_builtins.cmd       |    8 ++++++++
 programs/cmd/tests/test_builtins.cmd.exp |    6 ++++++
 programs/cmd/wcmdmain.c                      |   18 ++++++++++++++----
 3 files changed, 28 insertions(+), 4 deletions(-)
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