Address minor compiler warnings

Address minor compiler warnings

    copydir.c:666:44: warning: unsigned conversion from 'int' to '__mode_t' {aka 'unsigned int'} changes value from '-4096' to '4294963200' [-Wsign-conversion]
      666 |         if (   (mknod (dst, statp->st_mode & ~07777, statp->st_rdev) != 0)
          |                                            ^

    copydir.c:116:1: warning: missing initializer for field 'quote' of 'struct error_context' [-Wmissing-field-initializers]
      116 | };
          | ^
    In file included from copydir.c:27:
    /usr/include/attr/error_context.h:30:23: note: 'quote' declared here
       30 |         const char *(*quote) (struct error_context *, const char *);
          |                       ^~~~~