[msvcrt] fix fstat's handling of pipes and char devices

[Damjan Jovanovic]

This allows Java 1.4.1's jdb.exe to run without crashing when any
button is pressed.

Changelog:
* fixed fstat's handling of pipes and char devices (for pipes/char
devices, st_dev and st_rdev should be the fd, st_nlink is always 1,
and st_mode is S_IFIFO and S_IFCHR respectively).
* added tests to prove the new behaviour right

Damjan Jovanovic
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