visionOS: WKTR TestWTFAlwaysMissing fails to build

https://bugs.webkit.org/show_bug.cgi?id=266238
rdar://119502325

Reviewed by Wenson Hsieh.

* Tools/TestWebKitAPI/Tests/WTF/darwin/libTestWTFAlwaysMissing-iOS.tbd:
Add visionOS to the TBD.

Canonical link: https://commits.webkit.org/271887@main

Tools/TestWebKitAPI/Tests/WTF/darwin/libTestWTFAlwaysMissing-iOS.tbd

@@ -4,13 +4,15 @@ targets:         [ i386-ios-simulator, i386-tvos-simulator, i386-watchos-simulat
                    x86_64-ios-simulator, x86_64-tvos-simulator, x86_64-watchos-simulator,
                    armv7-ios, armv7-watchos, armv7s-ios, arm64-ios, arm64-tvos, arm64-watchos,
                    arm64_32-watchos, arm64e-ios, arm64e-tvos, arm64e-watchos, arm64-ios-simulator,
-                   arm64-watchos-simulator, arm64-tvos-simulator ]
+                   arm64-watchos-simulator, arm64-tvos-simulator, arm64-xros, arm64e-xros,
+                   x86_64-xros-simulator, arm64-xros-simulator ]
 install-name:    '/usr/local/lib/libTestWTFAlwaysMissing.dylib'
 exports:
   - targets:         [ i386-ios-simulator, i386-tvos-simulator, i386-watchos-simulator,
                        x86_64-ios-simulator, x86_64-tvos-simulator, x86_64-watchos-simulator,
                        armv7-ios, armv7-watchos, armv7s-ios, arm64-ios, arm64-tvos, arm64-watchos,
                        arm64_32-watchos, arm64e-ios, arm64e-tvos, arm64e-watchos, arm64-ios-simulator,
-                       arm64-watchos-simulator, arm64-tvos-simulator ]
+                       arm64-watchos-simulator, arm64-tvos-simulator, arm64-xros, arm64e-xros,
+                       x86_64-xros-simulator, arm64-xros-simulator ]
     symbols:         [ _TestWTFAlwaysMissing, _TestWTFAlwaysMissingWithoutAttributeWeakImport ]
 ...