Bug fix: -as mkisofs did not unescape "\=" in the source part of pathspecs

xorriso/xorriso_private.h

@@ -528,7 +528,12 @@ struct XorrisO { /* the global context of xorriso */
  char loaded_boot_cat_path[SfileadrL];
 
  /* XORRISO options */
- int allow_graft_points;
+ int allow_graft_points;   /* if not zero: yes
+                              special options:
+                              bit1= continue unescaping after first real '='
+                                    (as mkisofs does,
+                                     but xorriso did not for years)
+                            */
 
  int allow_restore; /* -2=disallowed until special mode "unblock"
                        -1=permanently disallowed