Corrade and Magnum on Linux

[lecopivo]

To get corrade and magnum working on Linux I had to do a minor change.

1. Extension ".exe" was assumed for executable.
2. Removed default feature magnum[windowlesswglapplication] which is Windows only

I have tested it on few examples and it worked without a problem. However, a more through examination to test all possible plugins and extensions is probably necessary.

[msftclas]

All CLA requirements met.

[mosra]

@lecopivo ohoo, thanks! This was on my roadmap (I even have a dirty WIP patch lying around), but you were faster :)

Just one note: there's a builtin CMAKE_EXECUTABLE_SUFFIX variable that you can use instead of creating your own.

Removing the windows-specific default feature makes sense for now, however in the long run I actually wanted to have system-specific Default-Features (so picking one enabled-by-default application for every system, but -- a question for vcpkg developers: is there a possibility to specify Default-Features or a list of Features differently for each system (Windows, Linux, macOS)?

[mosra]

Oh, um, just in case I wasn't clear and it's blocking the merge (sorry): from my side it's completely fine to merge the changes in their current form.

[Squareys]

Looks good to me, too!

[mosra]

@alexkaratarakis @ras0219-msft any chance to get this merged? :) Thanks a lot!

[ras0219-msft]

Sorry for taking so long on this and thanks for the PR!

Unfortunately, the portfile isn't a "full" CMake context, so some settings like CMAKE_EXECUTABLE_SUFFIX aren't available :(

[mosra]

Ah, I see.

Thanks a lot for the merge! 👍