Make build of Kotlin module work with Java 8 again

kotlin/build.gradle

@@ -75,13 +75,23 @@ signing {
 	}
 }
 
+def kotlinCompilerArgs = [
+	"[email protected]:strict",
+	"-Xemit-jvm-type-annotations" // Required for annotations on type variables
+]
+
+// See https://github.com/jqwik-team/jqwik/issues/546#issuecomment-2180009926
+// Not supported by Java 8
+def isJava8 = javaTargetVersion  == '8' || javaTargetVersion == '1.8'
+if (!isJava8) {
+	kotlinCompilerArgs += [
+		"-Xjvm-target=${javaTargetVersion}"
+	]
+}
+
 tasks.withType(KotlinCompile).configureEach {
 	compilerOptions {
-		freeCompilerArgs = [
-			"[email protected]:strict",
-			"-Xemit-jvm-type-annotations", // Required for annotations on type variables
-			"-Xjdk-release=${javaTargetVersion}" // See https://github.com/jqwik-team/jqwik/issues/546#issuecomment-2180009926
-		]
+		freeCompilerArgs = kotlinCompilerArgs
 		apiVersion = KotlinVersion.KOTLIN_1_9
 		languageVersion = KotlinVersion.KOTLIN_1_9
 		javaParameters = true // Required to get correct parameter names in reporting

kotlin/src/test/kotlin/net/jqwik/kotlin/SizableArbitraryExtensionsTests.kt

@@ -35,7 +35,7 @@ class SizableArbitraryExtensionsTests {
     @Example
     fun `StreamArbitrary ofSize() with range`(@ForAll random: Random) {
         val sizableArbitrary: StreamArbitrary<Int> = Int.any().stream().ofSize(2..12)
-        checkAllGenerated(sizableArbitrary, random) { sizable -> sizable.toList().size in 2..12 }
+        checkAllGenerated(sizableArbitrary, random) { sizable -> sizable.count() in 2..12 }
     }
 
     @Example