[K/N][gradle][interop] Refactored ToolConfig

Added possibility to create different strategies for loading libclang

kotlin-native/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/AbstractToolConfig.kt

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2010-2021 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.konan.target
+
+import org.jetbrains.kotlin.konan.util.defaultTargetSubstitutions
+
+abstract class AbstractToolConfig(konanHome: String, userProvidedTargetName: String?, propertyOverrides: Map<String, String>) {
+    private val distribution = Distribution(konanHome, propertyOverrides = propertyOverrides)
+    private val platformManager = PlatformManager(distribution)
+    private val targetManager = platformManager.targetManager(userProvidedTargetName)
+    private val host = HostManager.host
+    val target = targetManager.target
+
+    protected val platform = platformManager.platform(target)
+
+    val substitutions = defaultTargetSubstitutions(target)
+
+    fun downloadDependencies() = platform.downloadDependencies()
+
+    val llvmHome = platform.absoluteLlvmHome
+    val sysRoot = platform.absoluteTargetSysRoot
+
+    val libclang = when (host) {
+        KonanTarget.MINGW_X64 -> "$llvmHome/bin/libclang.dll"
+        else -> "$llvmHome/lib/${System.mapLibraryName("clang")}"
+    }
+
+    abstract fun loadLibclang()
+
+    fun prepare() {
+        downloadDependencies()
+
+        loadLibclang()
+    }
+}