Log Message:
Fix build with current ocaml.

While here update to latest version - 1.96

ersion 1.96, September 29, 2010
================================
 o option -debug now prints the exact BibTeX commmand which is run
 o new option --note-html similar to --note but assuming a bibtex
   field already in HTML format
 o various little changes in the Makefile requested by the Debian maintainer

Version 1.95, March 23, 2010
============================
 o bib2bib: option "--php-output" to produce output as a PHP 2D array
 o bib2bib: options "--remove" and "--rename", to remove or \ 
rename fields
 o new headers with proper copyright
 o bib2bib: option "--no-comment", to prevent generation of extra
   comments
 o fixed support for DOI links: when field "doi" is already an URL, the
   DOI prefix is not prepended
 o tags "bibtexnumber" and "bibtexitem" are now inserted to \ 
ease the
   customization using CSS

Version 1.94, 07/05/09
======================
 o support for arXiv preprints links: a field "eprint = {xxx}" will be
   recognized, if any, and a link to http://arxiv.org/abs/ will be displayed;
   option -noeprint turns it off and option -eprintf-prefix <url> sets a
   different prefix for the urls (contributed by Ari Stern)

Version 1.93, 12/12/08
======================
 o bib2bib: giving '$date' as argument of option -s allows to sort from
   oldest to newest entry
 o bib2bib: field names in conditions may contain digits and '-' (usefull for
   custom fields)

Version 1.92, 08/07/08
======================
 o Windows installer (using NSIS nsis.sourceforge.net)
 o new bib2bib option --expand-xrefs to perform crossrefs expansion
 o option -m (reading macros from a file):
   - fixed macro definition with \def
   - macros with arguments are now supported
 o added accents conversion for tilda, and fixed accents conversion
   for \"i, \"\i and such (patch by Samuel Colin)
 o fixed bib2bib command line options to accept --warn-error and
   --quiet (as described in the manual)

Version 1.91, 20/02/2008
========================
 o fixed bug in bib2bib and bibtex2html when quotes (") are used in fields
 o fixed bug with -nobibsource and -multiple (bib links on the separate pages)

Version 1.90, 01/02/2008
========================
 o bib2bib: = and <> are now case insensitive; use == and != instead
   to perform case sensitive comparison
 o correctly support $x$$y$ where the central $$ is not passing into
   display math mode
 o more cases for accent macros \' \~ \. \u \v (patch by John Kewley)