Add libpng to dependencies (required by freetype)

[kryksyh]

Resolves: compilation failure on macos

• I signed the CLA as username:
• The title of the PR describes the problem it addresses.
• Each commit's message describes its purpose and effects, and references the issue it resolves. If changes are extensive, there is a sequence of easily reviewable commits.
• The code in the PR follows the coding rules.
• I understand all aspects of the code I'm contributing and I'm able to explain it if requested.
• The code compiles and runs on my machine, preferably after each commit individually. I have manually tested and verified that my changes fulfil their intended purpose.
• No prior attempts to resolve this problem exist, or if they do, I listed them in my PR description and described how I avoided repeating past mistakes.
• There are no unnecessary changes.
• I created a unit test or vtest to verify the changes I made (if applicable).

Build configuration

audacity: audacity/audacity/master
audacity platforms: linux_x64
musescore: musescore/MuseScore/main
musescore platforms: linux_x64

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ℹ️ Recent review info

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Run ID: 2a00bb08-694e-4f12-a28e-3b3454e45001

📥 Commits

Reviewing files that changed from the base of the PR and between a599a97 and 8aa660f.

📒 Files selected for processing (1)

• buildscripts/cmake/ExtDepsManifest.cmake

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📝 Walkthrough

Walkthrough

The CMake dependency manifest now conditionally includes the libpng dependency when MUSE_MODULE_DRAW is enabled.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the main change to add libpng for freetype on macOS.
Description check	✅ Passed	The description mostly matches the template and includes the checklist and build config, though the issue reference is generic and one test checkbox is left unchecked.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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