MSVCRT: _tempnam not working with environment variables

[Phil Lodwick]

On 8-Nov-05 I submitted a patch to msvcrt _tempnam.  On the suggestion of
James Hawkins I have written a conformance test that shows my previous patch
did not go far enough.  Previously _tempnam just used GetTempFileNameA and
ignored environment variables.  My previous patch added support for
environment variables, but still called GetTempFileNameA.  However,
GetTempFileNameA truncated the supplied prefix to 3 characters which _tempnam
does not.  My new implementation removes the dependency on GetTempFileNameA.

Phil

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ChangeLog:
_tempnam uses the TMP environment variable and does not truncate prefix


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