build: skip Lottie expression examples when unsupported

[Nor-s]

Check for Lottie expression support separately from the base Lottie module so non-expression examples can still be built.

[Copilot]

🟢 Approval recommended

The change is a low-risk build-system adjustment that conditionally compiles optional examples without altering runtime code paths.

Pull request overview

Updates the Meson build logic for the example binaries so that Lottie “expression” examples are only included when the installed ThorVG build exposes expression support, allowing non-expression Lottie examples to still build successfully.

Changes:

• Removes expression-related example sources from the unconditional Lottie example list.
• Adds a separate compile/link probe for tvg::LottieAnimation::expressions() and conditionally enables expression examples based on the result.
• Improves build-time messaging to clarify when expression examples are skipped.

File summaries

File	Description
src/meson.build	Splits Lottie example enablement into base Lottie vs. expression-capable Lottie, conditionally adding expression example sources.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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[hermet]

Let's leave it. LottieAnimation::expressions() is one another runtime example.