wxGTK*: Remove abandoned dependencies

[jtojnar]

Motivation for this change

The many-years abandoned GStreamer 0.10 branch no longer builds so let's remove it. Hopefully nothing used it these days.

GConf has been abandoned for years too and would not work without user running the daemon.

cc #39975 #93540

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[7c6f434c]

Erm, this flat-out breaks the build, though? Are there some flags to pass?

[jtojnar]

At least 28 builds fine.

From the error message, it sounds like it revealed an underspecified dependency that was previously masked by propagation:

./vidxanm.cpp:23:10: fatal error: X11/Intrinsic.h: No such file or directory
   23 | #include <X11/Intrinsic.h>
      |          ^~~~~~~~~~~~~~~~~
compilation terminated.

Did not have time to look into it yet, though.

Edit: Looks like it does not affect the build.

[7c6f434c]

One of the builds seems to complain explicitly about gstreamer not found, though.

[jtojnar]

Seems to build now, after removing a configure flag.

[jtojnar]

Let's see what it breaks (or rather reveals as broken).