New packages: sstp-client-1.0.20 and network-manager-sstp-1.3.2

[kalelidev]

This adds the SSTP client from https://gitlab.com/sstp-project/sstp-client.

This adds support for the SSTP VPN plugin in NetworkManager from https://gitlab.gnome.org/GNOME/network-manager-sstp.

• sstp-client-1.0.20: Base SSTP VPN client.
• network-manager-sstp-1.3.2: NetworkManager plugin for SSTP, depends on sstp-client.
  Includes patch to fix obsolete GTK4 spacing in UI generation.

Combined into one PR to resolve dependency for CI/build.

Shared library registration
Added to common/shlibs:

Testing the changes
I tested the changes in this PR: YES
New package
This new package conforms to the package requirements: YES
Local build testing
I built this PR locally for my native architecture, x86_64-glibc
I built this PR locally for these architectures:
aarch64 (cross)

[Duncaen]

Since this depends on another new package in a separate pull request you should put them together in one request so that CI can build it and merging doesn't require merging two separate PRs.

[kalelidev]

Since this depends on another new package in a separate pull request you should put them together in one request so that CI can build it and merging doesn't require merging two separate PRs.

Thanks for the heads-up.
You're right that it depends on another new package from a separate PR, but I don't recall opening another simultaneous PR for the dependency—could you let me know which PR number you're referring to (#XXXXX?) so I can check and fix it?
If needed, I'll close this one and combine them into a single PR so the CI can build everything without issues. Just let me know.

[Duncaen]

I meant to comment this in #59016, since that one depends on this PR.

[kalelidev]

I meant to comment this in #59016, since that one depends on this PR.

@Duncaen Thanks for the heads-up earlier!

I've now combined both packages into this PR (#58994):

• Added sstp-client-1.0.20 (already there)
• Added network-manager-sstp-1.3.2 with GTK4 spacing fix patch
• Included the GNOME subpackage as symlink (standard for NM plugins)

Closed the separate #59016.

CI should now build everything together without dependency issues.
Let me know if the patch needs tweaks or if there's anything else!