ntdll: support Linux special devices when defined as a dos device

[Guy Albertelli]

When we are attempting to translate a dos device letter reference
(specified as "\\.\C:" or "\\?\C:") then:

1. If we have linked a Linux special device to a dos drive letter (via
winecfg or other method), return the special device name as the converted
unix file name.

Note: that the permissions of the Linux special device are obeyed.
---
 dlls/ntdll/directory.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

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