YACCP (yet another compctl patch)

[Zefram <A.Main@dcs.warwick.ac.uk>]

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At the moment, compctl won't allow a prefix or suffix in an xor'ed
completion, but it will allow these in the effectively xor'ed parts of
an extended completion.  This patch simply removes this prohibition.
Tests don't reveal any problems with the use of this ability.

 -zefram

      Index: Src/builtin.c
      ***************
        		}
        		break;
        	    case 'P':
      - 		if (hx) {
      - 		    zerrnam(name, "no prefix allowed in xor'd (+) completion",
      - 			    NULL, 0);
      - 		    return 1;
      - 		}
        		if ((*argv)[1]) {
        		    cct.prefix = (*argv) + 1;
        		    *argv = "" - 1;
      --- 1849,1854 ----
      ***************
      *** 1866,1876 ****
        		}
        		break;
        	    case 'S':
      - 		if (hx) {
      - 		    zerrnam(name, "no suffix allowed in xor'd (+) completion",
      - 			    NULL, 0);
      - 		    return 1;
      - 		}
        		if ((*argv)[1]) {
        		    cct.suffix = (*argv) + 1;
        		    *argv = "" - 1;
      --- 1861,1866 ----

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