Add win32/fentool example.

[bplu4t2f]

Example for the additions in this PR: odin-lang/Odin#7651

This turned out to be a bit of a mouthful, but I needed to make sure that the PR actually survives pressure testing.

Need to sleep on it and make all types Ada_Case I guess.

Checklist before submitting:

• This example has been added to .github/workflows/check.yml (for automatic testing)
• This example compiles cleanly with flags -vet -strict-style -vet-tabs -disallow-do -warnings-as-errors
• This example the naming and style convention: https://github.com/odin-lang/examples/wiki/Naming-and-style-convention (exceptions can be made for ports of examples that need to match 1:1 to the original source).
• By submitting, I understand that this example is made available under these licenses: Public Domain and Odin's zlib license. Only for third-party dependencies are other licenses allowed.