message: Fix CocoaPod Podspec for Xcode 12
diff: @@ -8,6 +8,12 @@ Pod::Spec.new do |spec|
  spec.platform = :ios, "11.0"
  spec.source = { :http => "https://github.com/google/filament/releases/download/v1.9.2/filament-v1.9.2-ios.tgz" }
  + # Fix linking error with Xcode 12; we do not yet support the simulator on Apple silicon.
  + spec.pod_target_xcconfig = {
  + 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'arm64'
  + }
  + spec.user_target_xcconfig = { 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'arm64' }
  +
  spec.subspec "filament" do |ss|
  ss.source_files =
  "include/filament/*.h",
  