fix compiler warnings

[tgauth]

PR Summary

• fix a few comp. warnings

[tgauth]

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[Copilot]

Pull Request Overview

This PR fixes several compiler warnings related to type mismatches and unsafe function usage in the Windows compatibility layer.

• Changed variable types from int to size_t to fix signed/unsigned comparison warnings
• Replaced deprecated getenv() with secure _dupenv_s() function to fix security warnings
• Added explicit casting to resolve integer comparison warnings

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
contrib/win32/win32compat/win32_dirent.c	Changed path_len from int to size_t to match pointer arithmetic result type
contrib/win32/win32compat/w32fd.c	Replaced getenv() with _dupenv_s() and added length check for safer environment variable access
contrib/win32/win32compat/misc.c	Added explicit cast to int to fix signed/unsigned comparison warning
contrib/win32/win32compat/fileio.c	Changed loop variable from int to size_t to match bytes_to_copy parameter type

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[tgauth]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).