Fixes for CMake and 64-bit builds

[a1batross]

Tested to work on provided maps from latest release.

CMake now properly respects install path (which I personally use everywhere, but didn't knew it's broken even in hlsdk-portable), copies binaries to featureful directory and don't force default Unix install prefix (which we don't use anywhere).

I haven't tested other platforms than linux-amd64, but they all should work as well.

[a1batross]

While we're here, tested build with Clang 19.

Except that it spews tons of warnings about inconsistently missing override keyword, it works fine as well.

[FreeSlave]

Thanks!

There're a lot of HashLinks is broken messages when you open the door between monsters squads on the featureful_demo map. Could it be something with incompatibilities of the file format?

[FreeSlave]

Shouldn't this be a loop? Looks like only the first element is copied over

https://github.com/FWGS/hlsdk-portable/blob/0dd8f1b148f3afc310e072aec77b28a969562125/dlls/nodes.cpp#L2478

Upd: did a PR to main repo FWGS#507

[a1batross]

Thanks!

There're a lot of HashLinks is broken messages when you open the door between monsters squads on the featureful_demo map. Could it be something with incompatibilities of the file format?

Did you made any changes to nodes format?

This code is basically from hlsdk-portable and it should just work. It was contributed by somebody else and I'm not sure how it should work.

[FreeSlave]

@a1batross I fixed it in the PR to hlsdk-portable