[shims] Remove some obsolete shims modules

The corresponding overlays are maintained outside of this repository, and they haven’t been importing these shims for years.

SDKs that shipped between Xcode 10.2 and Xcode 11 (or so) contained overlay modules that imported these shims modules, so future toolchain builds won’t work correctly with those SDKs. (This is fine! We do not expect toolchain builds to work with years old Xcode installations anyway.)

Author: lorentey

stdlib/public/SwiftShims/AppKitOverlayShims.h

@@ -24,16 +24,9 @@ set(sources
   _SwiftConcurrency.h
   _SwiftDistributed.h
 
-  CoreMediaOverlayShims.h
   DispatchOverlayShims.h
-  NetworkOverlayShims.h
-  OSOverlayShims.h
   ObjectiveCOverlayShims.h
-  SafariServicesOverlayShims.h
-  AppKitOverlayShims.h
-  UIKitOverlayShims.h
   XCTestOverlayShims.h
-  XPCOverlayShims.h
 
   CoreFoundationOverlayShims.h
   CFCharacterSetShims.h
@@ -55,8 +48,6 @@ set(sources
   NSTimeZoneShims.h
   NSUndoManagerShims.h
 
-  ClockKitOverlayShims.h
-
   module.modulemap
   )
 set(output_dir "${SWIFTLIB_DIR}/shims")