Clean up XXX and FIXME

[flowerysong]

There aren't many of these, and none of them should be heavy lifts.

• OpenARC/libopenarc/arc-canon.c

  Lines 1116 to 1117 in a2c3fdb

  	/* XXX -- void? */
  	(void) arc_canon_header(msg, cur, &tmphdr, false);

  : d175426

• OpenARC/libopenarc/arc-canon.c

  Lines 968 to 969 in a2c3fdb

  	/* FIXME: this looks overly simplistic. tag-lists are allowed to
  	* contain FWS, and headers are allowed to contain CFWS.

  : eb89e81

• OpenARC/libopenarc/arc-keys.c

  Lines 342 to 343 in a2c3fdb

  	** XXX -- maybe deal with a partial reply rather than require
  	** it all

  : 45adf7a

• OpenARC/libopenarc/arc-util.c

  Lines 408 to 409 in a2c3fdb

  	** XXX -- maybe deal with a partial reply rather than require
  	** it all

  : 45adf7a

• OpenARC/libopenarc/base64.c

  Line 98 in a2c3fdb

  /* XXX -- don't bother checking for proper termination (for now) */

  : 019c5b6

• OpenARC/openarc/openarc.c

  Lines 2790 to 2791 in a2c3fdb

  	/* XXX -- result should be selectable */
  	return SMFIS_TEMPFAIL;

  : Make milter responses configurable #17

• OpenARC/openarc/openarc.c

  Lines 2994 to 2995 in a2c3fdb

  	/* FIXME: this should be configurable, and it might be better to
  	* default to rejecting the message.

  : Make milter responses configurable #17

• OpenARC/openarc/openarc.c

  Line 4674 in a2c3fdb

  /* XXX -- HAHAHAH => sa.sa_sigaction = NULL; */

  : a36c65e

• OpenARC/libopenarc/arc.c

  Line 3604 in a2c3fdb

  /* XXX -- wrapping needs to happen here */

  : 9f61859

• OpenARC/libopenarc/arc.c

  Line 3705 in a2c3fdb

  /* XXX -- wrapping needs to happen here */

  : 9f61859

• OpenARC/libopenarc/arc.c

  Lines 1574 to 1576 in a2c3fdb

  	if (isascii(*p) && !isprint(*p) && !isspace(*p))
  	{
  	/* FIXME: should this do more validation of UTF-8? */

  : 59249b8