kotlin-test-native-xctest: avoid separate cinterop for the test task

test compilations use cinterop from the main task. Adding a separate
dependency breaks some invariants inside KGP

Author: sbogolepov

native/kotlin-test-native-xctest/build.gradle.kts

@@ -111,7 +111,7 @@ kotlin {
 
         forEach {
             val copyTask = registerCopyFrameworkTask(it.konanTarget)
-            it.compilations.all {
+            it.compilations.getByName("main") {
                 cinterops {
                     register("XCTest") {
                         compilerOpts("-iframework", copyTask.map { it.destinationDir }.get().absolutePath)