[alessandro-zanni]

Part of streamyfin/streamyfin#2080 (a native Mac Catalyst build of Streamyfin). The Streamyfin side is ready on alessandro-zanni/streamyfin@feat/mac-catalyst. It needs an MPVKit.xcframework with a maccatalyst slice, which the current release doesn't ship.

Changes

• fix(build): pass the iOSSupport framework path to Mac Catalyst cflags. vo_avfoundation.m imports UIKit/UIKit.h, which on Catalyst lives under the macOS SDK's System/iOSSupport tree. ldFlags already added -iframework …/iOSSupport/… for maccatalyst but cFlags did not, so libmpv failed with 'UIKit/UIKit.h' file not found. That was the only compile error; ffmpeg and every other dependency already build for maccatalyst, so the old TODO about ffmpeg failing there no longer applies.
• feat(build): include the Mac Catalyst slice in MPVKit.xcframework. create-combined-framework.sh had the four iOS/tvOS slices hardcoded, both in the platform loop and in the hand-written xcframework Info.plist. It now adds whichever platforms were built, maccatalyst included (ios-arm64_x86_64-maccatalyst, SupportedPlatformVariant = maccatalyst), so a partial build no longer fails on a missing slice. rebuild-libmpv.sh also rebuilds maccatalyst.

iOS/tvOS output is unchanged: same slices, same Info.plist entries.

Testing

• make gpl platform=maccatalyst on Xcode 27.0: every library builds for arm64 + x86_64, and the combined xcframework lists ios-arm64_x86_64-maccatalyst (plutil -lint OK, lipo: x86_64 arm64).
• With that xcframework, Streamyfin builds and runs as a Mac Catalyst app (Mac idiom). Login, browsing and playback with ASS subtitles through vo=avfoundation work.
• Not tested: a make gpl of all five platforms in one run. I only built the maccatalyst slice.

To ship it

A release built with platform=ios,isimulator,tvos,tvsimulator,maccatalyst (then upload-framework.sh) would let Streamyfin point its podspec at it.

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[alessandro-zanni]

Retargeted this to avfoundation-ao-tvos, where #1, #3 and #4 go: release/0.41.0-av5 is already merged there, and the two commits apply cleanly on top.

A short recap for review:

• What it adds: a maccatalyst slice (arm64 + x86_64) in MPVKit.xcframework, next to the existing iOS, simulator and tvOS slices. The iOS and tvOS slices are built exactly as before.
• Why: it's the only missing piece for a Mac Catalyst build of Streamyfin ([REQUEST]: Native Mac Catalyst build streamyfin#2080). The app side already builds and runs against a local xcframework built from this branch; it just can't use a release until one ships this slice.
• The one non-obvious change: Catalyst cflags need the iOSSupport framework path (68e2b94), otherwise the UIKit/AVKit headers resolve against the macOS SDK.

Happy to adjust anything. Once it is in, Streamyfin needs a pre-release that ships the slice to point its podspec at.