Update OpenCore to 0.6.8

src/0001-vboxhfs.patch

@@ -1,27 +0,0 @@
-diff --git a/Staging/VBoxHfs/fsw_hfs.c b/Staging/VBoxHfs/fsw_hfs.c
-index a5b3565d..9ca3d0f1 100644
---- a/Staging/VBoxHfs/fsw_hfs.c
-+++ b/Staging/VBoxHfs/fsw_hfs.c
-@@ -1042,20 +1042,20 @@ fsw_hfs_cmpf_catkey (BTreeKey *btkey1, BTreeKey *btkey2)
-
- 		for (ac = 0; ac == 0 && apos < ckey1nlen; apos++) {
- 			ac = be16_to_cpu (p1[apos]);
--			ac = fsw_to_lower (ac);
-+			ac = ac ? fsw_to_lower (ac) : 0xFFFF;
- 		}
-
- 		/* get next valid character from ckey2 */
-
- 		for (bc = 0; bc == 0 && bpos < ckey2nlen; bpos++) {
- 			bc = p2[bpos];
--			bc = fsw_to_lower (bc);
-+			bc = bc ? fsw_to_lower (bc) : 0xFFFF;
- 		}
-
- 		if (ac != bc)
- 			break;
-
--		if (ac == 0)
-+		if (bpos == ckey1nlen)
- 			return 0;
- 	}