* Bump for Xcode 11 beta 4
xtro tests will fail until we have an update for sharpie, however
the introspection tests should be fine (with the small changes in
arkit.cs and uikit.cs)
xtro failure:
```
System.NotImplementedException: AVAudioInteger
at (wrapper managed-to-native) Clang.Ast.AstReader.LoadInternal(Clang.Ast.AstReader,string)
at Clang.Ast.AstReader.Load (System.String astPath) [0x00014] in /Users/builder/vsts-agent/_work/5/s/Clang/Ast/AstReader.cs:33
at Extrospection.Runner.Execute (System.String pchFile, System.Collections.Generic.IEnumerable`1[T] assemblyNames) [0x0019a] in /Users/poupou/git/xcode11/xamarin-macios/tests/xtro-sharpie/Runner.cs:54
at Extrospection.MainClass.Main (System.String[] args) [0x00046] in /Users/poupou/git/xcode11/xamarin-macios/tests/xtro-sharpie/Program.cs:20
```
due to
```diff
-typedef CF_ENUM(NSInteger, AVAudioSessionErrorCode) {
+typedef CF_ENUM(AVAudioInteger, AVAudioSessionErrorCode) {
```
https://github.com/xamarin/xamarin-macios/wiki/CoreAudioTypes-iOS-xcode11-beta4
* [tests] CoreText stopped reporting error when font files are missing
* Fix xtro (EnumCheck.cs) and update its data files
* Fix xtro results (due to some local changes)
Matt Sylvia
Vincent Dondain
Rolf Bjarne Kvinge
Sebastien Pouliot
Connor Adsit
Sebastien Pouliot
Matt Sylvia