[cmake] Use list(REMOVE_ITEM...) to change architectures

Author: benlangmuir

cmake/modules/DarwinSDKs.cmake

@@ -9,10 +9,10 @@ set(SUPPORTED_XROS_ARCHS "arm64;arm64e")
 set(SUPPORTED_XROS_SIMULATOR_ARCHS "arm64")
 
 if(SWIFT_DARWIN_DEPLOYMENT_VERSION_WATCHOS VERSION_GREATER_EQUAL 7.0)
-  set(SUPPORTED_WATCHOS_SIMULATOR_ARCHS "x86_64;arm64")
+  list(REMOVE_ITEM SUPPORTED_WATCHOS_SIMULATOR_ARCHS "i386")
 endif()
 if(SWIFT_DARWIN_DEPLOYMENT_VERSION_WATCHOS VERSION_GREATER_EQUAL 9.0)
-  set(SUPPORTED_WATCHOS_ARCHS "arm64_32")
+  list(REMOVE_ITEM SUPPORTED_WATCHOS_ARCHS "armv7k")
 endif()
 
 is_sdk_requested(OSX swift_build_osx)