File recognition for CTM deltas

[Julian H. Stacey]

I hacked 8.2-RELEASE /usr/src/contrib/file/ to recognise CTM deltas.
	http://berklix.com/~jhs/src/bsd/fixes/FreeBSD/src/gen/contrib/file/
I (or someone else) could look at 2 points marked JJLATER, before I run send-pr.

It now reports:
  file -z src-9.0001.gz src-9.0077.gz
    src-9.0001.gz: ctm input text \
	(gzip compressed data, from Unix, \
	last modified: Sun Sep 25 03:36:30 2011, max compression)
    src-9.0077.gz: ctm input text \
	(gzip compressed data, from Unix, \
	last modified: Sat Dec 24 07:04:11 2011, max compression)

whereas it used to report:
  file -z src-9.000[12].gz
    src-9.0001.gz: ASCII English text \
	(gzip compressed data, from Unix, \
	last modified: Sun Sep 25 03:36:30 2011, max compression)
    src-9.0002.gz: troff or preprocessor input text \
	(gzip compressed data, from Unix, \
	last modified: Tue Sep 27 23:15:29 2011, max compression)

Cheers,
Julian
-- 
Julian Stacey, BSD Unix Linux C Sys Eng Consultants Munich http://berklix.com
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