Revise build options for MSVC

[Chocobo1]

• Use proper file extension The file is actually a "Module-Definition (.def)" file: https://learn.microsoft.com/en-us/cpp/build/reference/module-definition-dot-def-files?view=msvc-170
• Remove /MACHINE linker option This option isn't strictly required and MSVC is able to auto-detect it. Specifying x64 might break compilation when targeting Win32 platform.
• Use correct MSVC runtime library when building in Debug mode

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.26%. Comparing base (bf99982) to head (91083ee).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #551 +/- ## ======================================= Coverage 88.26% 88.26% ======================================= Files 58 58 Lines 13587 13587 ======================================= Hits 11993 11993 Misses 1594 1594 ```

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