jklib: add JDK_17_0 environment variable support to tests

compiler/jklib.tests/build.gradle.kts

diff --git a/compiler/jklib.tests/build.gradle.kts b/compiler/jklib.tests/build.gradle.kts
index 23adcbd..c7f9b67 100644
--- a/compiler/jklib.tests/build.gradle.kts
+++ b/compiler/jklib.tests/build.gradle.kts
@@ -31,7 +31,7 @@
 
     testTask(
         jUnitMode = JUnitMode.JUnit5,
-        defineJDKEnvVariables = listOf(JdkMajorVersion.JDK_1_8, JdkMajorVersion.JDK_11_0)
+        defineJDKEnvVariables = listOf(JdkMajorVersion.JDK_1_8, JdkMajorVersion.JDK_11_0, JdkMajorVersion.JDK_17_0)
     ) {
         val klibProvider = objects.newInstance<SystemPropertyClasspathProvider>().apply {
             property.set("kotlin.stdlib.jklib.for.test")