[Native] Support Xcode 15.3 — add back the TargetConditional.h macros

^KT-65542

native/utils/src/org/jetbrains/kotlin/konan/target/ClangArgs.kt

@@ -134,6 +134,31 @@ sealed class ClangArgs(
         if (environmentOsVersionMinRequired != null) {
             add(listOf("-D__ENVIRONMENT_OS_VERSION_MIN_REQUIRED__=$environmentOsVersionMinRequired"))
         }
+
+        val targetConditionals = when (target) {
+            KonanTarget.MACOS_ARM64, KonanTarget.MACOS_X64 -> hashMapOf(
+                "TARGET_OS_OSX" to "1",
+            )
+            KonanTarget.IOS_ARM64 -> hashMapOf(
+                "TARGET_OS_EMBEDDED" to "1",
+                "TARGET_OS_IPHONE" to "1",
+                "TARGET_OS_IOS" to "1",
+            )
+            KonanTarget.TVOS_ARM64 -> hashMapOf(
+                "TARGET_OS_EMBEDDED" to "1",
+                "TARGET_OS_IPHONE" to "1",
+                "TARGET_OS_TV" to "1",
+            )
+            KonanTarget.WATCHOS_ARM64, KonanTarget.WATCHOS_ARM32, KonanTarget.WATCHOS_DEVICE_ARM64 -> hashMapOf(
+                "TARGET_OS_EMBEDDED" to "1",
+                "TARGET_OS_IPHONE" to "1",
+                "TARGET_OS_WATCH" to "1",
+            )
+            else -> null
+        }
+        if (targetConditionals != null) {
+            add(targetConditionals.map { "-D${it.key}=${it.value}" })
+        }
     }.flatten()
 
     private val specificClangArgs: List<String> = when (target) {