3882 remove xmod & friends

*** 31,41 ****
  /*
   *      A one-rotor machine designed along the lines of Enigma
   *      but considerably trivialized.
   */
  
- /* EXPORT DELETE START */
  #define ECHO 010
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <string.h>
--- 31,40 ----
*** 94,109 ****
                  t3[ic] = k;
          }
          for (i = 0; i < ROTORSZ; i++)
                  t2[t1[i]&MASK] = i;
  }
- /* EXPORT DELETE END */
  
  int
  main(int argc, char **argv)
  {
- /* EXPORT DELETE START */
          extern int optind;
          char *p1;
          int i, n1, n2, nchar;
          int c;
          struct {
--- 93,106 ----
*** 197,203 ****
                          n2++;
                          if (n2 == ROTORSZ) n2 = 0;
                  }
          }
          return (0);
- /* EXPORT DELETE END */
  }
--- 194,199 ----