Add emulator properties to gcc configurables

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

@@ -63,6 +63,15 @@ interface Configurables : TargetableExternalStorage {
     val runtimeDefinitions get() = targetList("runtimeDefinitions")
 }
 
+interface ConfigurablesWithEmulator : Configurables {
+    val emulatorDependency get() = hostTargetString("emulatorDependency")
+    // TODO: We need to find a way to represent absolute path in properties.
+    //  In case of QEMU, absolute path to dynamic linker should be specified.
+    val emulatorExecutable get() = hostTargetString("emulatorExecutable")
+
+    val absoluteEmulatorExecutable get() = absolute(emulatorExecutable)
+}
+
 interface TargetableConfigurables : Configurables {
     val targetArg get() = targetString("quadruple")
 }

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

@@ -19,7 +19,10 @@ package org.jetbrains.kotlin.konan.target
 import org.jetbrains.kotlin.konan.properties.*
 
 class GccConfigurablesImpl(target: KonanTarget, properties: Properties, baseDir: String?)
-    : GccConfigurables, KonanPropertiesLoader(target, properties, baseDir)
+    : GccConfigurables, KonanPropertiesLoader(target, properties, baseDir), ConfigurablesWithEmulator {
+    override val dependencies: List<String>
+        get() = super.dependencies + listOfNotNull(emulatorDependency)
+    }
 
 class AndroidConfigurablesImpl(target: KonanTarget, properties: Properties, baseDir: String?)
     : AndroidConfigurables, KonanPropertiesLoader(target, properties, baseDir)