lcevcdec: fix pkg-config version data

[FliegendeWurst]

Upstream now installs their own .pc file, which
we must patch to specify the correct version.

Fixes #392771

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[thefossguy]

LGTM

[FliegendeWurst]

Note: the new .pc file is equal to the previous one, except for the Version line. I'll merge after ffmpeg-full built successfully.

[FliegendeWurst]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 392810

---

x86_64-linux

✅ 10 packages built:

• ffmpeg-full
• ffmpeg-full.bin (ffmpeg-full.bin.bin ,ffmpeg-full.bin.data ,ffmpeg-full.bin.dev ,ffmpeg-full.bin.doc ,ffmpeg-full.bin.lib ,ffmpeg-full.bin.man)
• ffmpeg-full.data (ffmpeg-full.data.bin ,ffmpeg-full.data.data ,ffmpeg-full.data.dev ,ffmpeg-full.data.doc ,ffmpeg-full.data.lib ,ffmpeg-full.data.man)
• ffmpeg-full.dev (ffmpeg-full.dev.bin ,ffmpeg-full.dev.data ,ffmpeg-full.dev.dev ,ffmpeg-full.dev.doc ,ffmpeg-full.dev.lib ,ffmpeg-full.dev.man)
• ffmpeg-full.doc (ffmpeg-full.doc.bin ,ffmpeg-full.doc.data ,ffmpeg-full.doc.dev ,ffmpeg-full.doc.doc ,ffmpeg-full.doc.lib ,ffmpeg-full.doc.man)
• ffmpeg-full.lib (ffmpeg-full.lib.bin ,ffmpeg-full.lib.data ,ffmpeg-full.lib.dev ,ffmpeg-full.lib.doc ,ffmpeg-full.lib.lib ,ffmpeg-full.lib.man)
• ffmpeg-full.man (ffmpeg-full.man.bin ,ffmpeg-full.man.data ,ffmpeg-full.man.dev ,ffmpeg-full.man.doc ,ffmpeg-full.man.lib ,ffmpeg-full.man.man)
• lcevcdec
• lcevcdec.dev (lcevcdec.dev.dev ,lcevcdec.dev.lib)
• lcevcdec.lib (lcevcdec.lib.dev ,lcevcdec.lib.lib)

No regressions expected, as explained above.