[FIXED JENKINS-17681] Do not try to call resolveSymlink on a nonexistent link as you will just get an IOException, breaking peephole permalinks in some Windows environments.

core/src/main/java/hudson/Util.java

@@ -1200,6 +1200,10 @@ public class Util {
             } catch (ClassNotFoundException x3) {
                 assert false : x3; // should be Java 7+ here
             }
+            if (x2.getClass().getName().equals("java.nio.file.FileSystemException")) {
+                // Thrown ("Incorrect function.") on JDK 7u21 in Windows 2012 when called on a non-symlink, rather than NotLinkException, contrary to documentation. Maybe only when not on NTFS?
+                return null;
+            }
             if (x2 instanceof IOException) {
                 throw (IOException) x2;
             }