ReceivePackAdvertiseRefsHookTest.testSuccess() fails on Windows

The TransportLocal object created in
newTransportLocalWithStrictValidation() closes original repository and
increments use of test internal "dst" repository, but never decrements
use. Because of this, pack file is not closed and during tearDown on
Windows system is unable to delete it.

Bug: 538068
Change-Id: I96df8e91abfee78c91cf26c2466718e9145a69db
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>

org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/ReceivePackAdvertiseRefsHookTest.java

@@ -259,6 +259,7 @@ public class ReceivePackAdvertiseRefsHookTest extends LocalDiskRepositoryTestCas
 		try (TransportLocal t = newTransportLocalWithStrictValidation()) {
 			t.setPushThin(true);
 			r = t.push(PM, Collections.singleton(u));
+			dst.close();
 		}
 
 		assertNotNull("have result", r);