Handle InternalError during symlink support detection on Windows

When JGit tries to detect symlink support the attempt to create a
symlink may fail with a java.lang.InternalError. This was reported for a
case where the application using JGit runs in Windows XP compatibility
mode using Oracle JDK 1.8. Handle this by assuming symlinks are not
supported in this case.

Bug: 471027
Change-Id: I978288754dea0c6fffd3457fad7d4d971e27c6c2
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/util/FS_Win32.java

@@ -171,7 +171,8 @@ public class FS_Win32 extends FS {
 			createSymLink(linkName, tempFile.getPath());
 			supportSymlinks = Boolean.TRUE;
 			linkName.delete();
-		} catch (IOException | UnsupportedOperationException e) {
+		} catch (IOException | UnsupportedOperationException
+				| InternalError e) {
 			supportSymlinks = Boolean.FALSE;
 		} finally {
 			if (tempFile != null)