RFR: JDK-8199703 Update platform.policy after JDK-8199636

[Magnus Ihse Bursie]

It turned out that the jaas_nt/jaas_unix names were hardcoded in a test. Following JDK-8199636, this test must also be updated.

Bug: https://bugs.openjdk.java.net/browse/JDK-8199703
Patch inline:
diff --git a/closed/test/jdk/com/sun/security/auth/module/PlatformLoginModule/platform.policy b/closed/test/jdk/com/sun/security/auth/module/PlatformLoginModule/platform.policy
--- a/closed/test/jdk/com/sun/security/auth/module/PlatformLoginModule/platform.policy
+++ b/closed/test/jdk/com/sun/security/auth/module/PlatformLoginModule/platform.policy
@@ -4,6 +4,5 @@
 
 grant codebase "file:./platform.jar" {
 
-    permission java.lang.RuntimePermission "loadLibrary.jaas_unix";
-    permission java.lang.RuntimePermission "loadLibrary.jaas_nt";
+    permission java.lang.RuntimePermission "loadLibrary.jaas";
 };

/Magnus