Tested versions

Reproducible in: 4.4.beta1 [4ce466d]

System information

Godot v4.4.beta1 - macOS Sequoia (15.2.0) - Multi-window, 1 monitor - Metal (Forward+) - integrated Apple M2 Pro (Apple8) - Apple M2 Pro (10 threads)

Issue description

When trying to export any project to iOS, you are currently met with the following errors when it tries to build the Xcode project:

Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_MTLFXSpatialScalerDescriptor", referenced from:
       in libgodot.a[1031](metal_device_properties.ios.template_debug.arm64.o)
  "_OBJC_CLASS_$_MTLFXTemporalScalerDescriptor", referenced from:
       in libgodot.a[1031](metal_device_properties.ios.template_debug.arm64.o)
ld: symbol(s) not found for architecture arm64

Given the symbols it's complaining about, I would imagine it's at least related to (if not caused by) #99603.

It's possible to work around this by manually adding MetalFX.framework as a linked library in Xcode, but I'm not sure what the implications of that are on the minimum required iOS version, given that MetalFX seems to be iOS 16 or later.

I imagine it's possible to add this library with something like add_ios_framework("MetalFX.framework") from within an EditorExportPlugin as well.

Steps to reproduce

1. Create a new project
2. Export to iOS
3. Note the error

Minimal reproduction project (MRP)

N/A