gralde-plugin, tests: Ignore 'target' test on Windows

tools/kotlin-native-gradle-plugin/src/test/groovy/org/jetbrains/kotlin/gradle/plugin/test/IncrementalSpecification.groovy

@@ -294,7 +294,7 @@ class IncrementalSpecification extends Specification {
         recompilationAndInteropProcessingHappened(*results)
     }
 
-    @IgnoreIf({ System.getProperty('os.name').contains('windows') })
+    @IgnoreIf({ System.getProperty('os.name').toLowerCase().contains('windows') })
     def 'target change should cause recompilation and interop reprocessing'() {
         when:
         def newTarget