Fix warnings in vl82c59x.c and m_at_socket4_5.c

[win2kgamer]

Summary

Fix two warnings in the newly-introduced VLSI SuperCore/Wildcat code

Checklist

• Closes #xxx
• I have tested my changes locally and validated that the functionality works as intended
• I have discussed this with core contributors already
• This pull request requires changes to the ROM set
  • I have opened a roms pull request - https://github.com/86Box/roms/pull/changeme/

References

Provide links to datasheets or other documentation that helped you implement this pull request.