[K/N] Fix CC in Xcode usage ^KTI-1553

- Perform all calls to xcrun in XcodeValueSource.
- Use the fully computed Xcode instance as the current Xcode instance.
- Hide all of this inside a Gradle plugin and apply it to kotlin-native
  project.

kotlin-native/build-tools/src/main/kotlin/org/jetbrains/kotlin/xcode/XcodeOverridePlugin.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.xcode
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.api.provider.Provider
+import org.gradle.kotlin.dsl.*
+import org.jetbrains.kotlin.konan.target.*
+import org.jetbrains.kotlin.konan.util.DependencyProcessor
+
+open class XcodeOverridePlugin : Plugin<Project> {
+    override fun apply(project: Project) {
+        // Only for macOS hosts.
+        if (!HostManager.hostIsMac)
+            return
+        // Only if we use regular Xcode installation.
+        if (DependencyProcessor.isInternalSeverAvailable)
+            return
+        val xcodeProvider: Provider<Xcode> = project.providers.of(XcodeValueSource::class) {}
+        Xcode.xcodeOverride = xcodeProvider.get()
+    }
+}

kotlin-native/build-tools/src/main/kotlin/org/jetbrains/kotlin/xcode/XcodeValueSource.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.xcode
+
+import org.gradle.api.provider.ValueSource
+import org.gradle.api.provider.ValueSourceParameters
+import org.jetbrains.kotlin.konan.target.*
+
+private class XcodeSnapshot(original: Xcode) : Xcode {
+    override val additionalTools = original.additionalTools
+    override val appletvosSdk = original.appletvosSdk
+    override val appletvsimulatorSdk = original.appletvsimulatorSdk
+    override val iphoneosSdk = original.iphoneosSdk
+    override val iphonesimulatorSdk = original.iphonesimulatorSdk
+    override val macosxSdk = original.macosxSdk
+    override val simulatorRuntimes = original.simulatorRuntimes
+    override val toolchain = original.toolchain
+    override val version = original.version
+    override val watchosSdk = original.watchosSdk
+    override val watchsimulatorSdk = original.watchsimulatorSdk
+}
+
+abstract class XcodeValueSource: ValueSource<Xcode, ValueSourceParameters.None> {
+    override fun obtain(): Xcode = XcodeSnapshot(Xcode.defaultCurrent())
+}