[K/N] Make AbstractNativeCInteropTest a bit more flexible

It probably requires a bit more thoughful refactoring, but before that
we need to collect more test-cases.

native/native.tests/tests/org/jetbrains/kotlin/konan/blackboxtest/AbstractNativeCInteropTest.kt

@@ -25,16 +25,22 @@ import java.io.File
 
 abstract class AbstractNativeCInteropFModulesTest : AbstractNativeCInteropTest() {
     override val fmodules = true
+
+    override val defFileName: String = "pod1.def"
 }
 
 abstract class AbstractNativeCInteropNoFModulesTest : AbstractNativeCInteropTest() {
     override val fmodules = false
+
+    override val defFileName: String = "pod1.def"
 }
 
 @Tag("cinterop")
 abstract class AbstractNativeCInteropTest : AbstractNativeCInteropBaseTest() {
     abstract val fmodules: Boolean
 
+    abstract val defFileName: String
+
     @Synchronized
     protected fun runTest(@TestDataFile testPath: String) {
         // FIXME: check the following failures under Android with -fmodules
@@ -46,7 +52,7 @@ abstract class AbstractNativeCInteropTest : AbstractNativeCInteropBaseTest() {
         val testPathFull = getAbsoluteFile(testPath)
         val testDataDir = testPathFull.parentFile.parentFile
         val includeFolder = testDataDir.resolve("include")
-        val defFile = testPathFull.resolve("pod1.def")
+        val defFile = testPathFull.resolve(defFileName)
         val defContents = defFile.readText().split("\n").map { it.trim() }
         val defHasObjC = defContents.any { it.endsWith("Objective-C") }
         Assumptions.assumeFalse(defHasObjC && !targets.testTarget.family.isAppleFamily)