hardcode rt builtin linking

Author: Karim Alweheshy

tools/generators/pbxnativetargets/src/Generator/CalculatePlatformVariantBuildSettings.swift

@@ -186,11 +186,15 @@ extension Generator.CalculatePlatformVariantBuildSettings {
         buildSettings.append(
             .init(
                 key: "LIBRARY_SEARCH_PATHS",
-                value: platformVariant.librarySearchPaths
-                    .map {
-                        let path = $0.path.split(separator: "/").dropFirst().joined(separator: "/")
-                        return "\"$(BAZEL_OUT)/\(path)\""
-                    }
+                value: (
+                    platformVariant.librarySearchPaths
+                        .map {
+                            let path = $0.path.split(separator: "/").dropFirst().joined(separator: "/")
+                            return "\"$(BAZEL_OUT)/\(path)\""
+                        } + [
+                            "\"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/16/lib/darwin\""
+                        ]
+                    )
                     .sorted()
                     .joined(separator: " ")
                     .pbxProjEscaped

tools/generators/pbxnativetargets/src/Generator/CreateBuildPhases.swift

@@ -281,7 +281,10 @@ extension Generator.CreateBuildPhases {
             )
         }
 
-        let librariesToLinkSubIdentifiers = consolidatedInputs.librariesToLinkPaths.map { bazelPath in
+        let libs = consolidatedInputs.librariesToLinkPaths + [
+            "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/16/lib/darwin/libclang_rt.iossim.a"
+        ]
+        let librariesToLinkSubIdentifiers = libs.map { bazelPath in
             return (
                 bazelPath,
                 createBuildFileSubIdentifier(