Native: disable running cinterop in Gradle process when building K/N

Building Kotlin/Native itself involves running cinterop in the Gradle
daemon process to reduce build time.
But this optimization appears to be incorrect when reusing Gradle daemon
for subsequent builds.

This commit disables the optimization by default, keeping enabling it
possible using `kotlin.native.allowRunningCinteropInProcess=true`
project property.

For more details see ^KT-61300

kotlin-native/tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/konan/KonanToolRunner.kt

@@ -16,6 +16,7 @@
 
 package org.jetbrains.kotlin.gradle.plugin.konan
 
+import kotlinBuildProperties
 import org.gradle.api.Project
 import org.jetbrains.kotlin.gradle.plugin.konan.KonanPlugin.ProjectProperty.KONAN_HOME
 import org.jetbrains.kotlin.konan.target.HostManager
@@ -51,7 +52,7 @@ internal abstract class KonanCliRunner(
     final override val mainClass get() = "org.jetbrains.kotlin.cli.utilities.MainKt"
     final override val daemonEntryPoint get() = "daemonMain"
 
-    final override val mustRunViaExec get() = false.also { System.setProperty(runFromDaemonPropertyName, "true") }
+    override val mustRunViaExec get() = false.also { System.setProperty(runFromDaemonPropertyName, "true") }
 
     final override val execSystemPropertiesBlacklist: Set<String>
         get() = super.execSystemPropertiesBlacklist + runFromDaemonPropertyName
@@ -136,12 +137,19 @@ internal class CliToolConfig(konanHome: String, target: String) : AbstractToolCo
 
 /** Kotlin/Native C-interop tool runner */
 internal class KonanCliInteropRunner(
-        project: Project,
+        private val project: Project,
         additionalJvmArgs: List<String> = emptyList(),
         konanHome: String = project.konanHome
 ) : KonanCliRunner("cinterop", project, additionalJvmArgs, konanHome) {
     private val projectDir = project.projectDir.toString()
 
+    override val mustRunViaExec: Boolean
+        get() = if (project.kotlinBuildProperties.getBoolean("kotlin.native.allowRunningCinteropInProcess")) {
+            super.mustRunViaExec
+        } else {
+            true
+        }
+
     override fun transformArgs(args: List<String>): List<String> {
         return super.transformArgs(args) + listOf("-Xproject-dir", projectDir)
     }