bug#28758: address@hidden: Update to at least revision 44704 to address bug in latexdiff

[Adonay Felipe Nogueira]

Since Perl 5.26.0, braces in RegExps have to be escaped if one wants
Perl to match these literally.

However, address@hidden --- from June 4th, 2017 --- doesn't implement the
fix made to latexdiff ([1][2]) --- made into TeX Live repository in June
26th, 2017.

Without the fix, `latexdiff' command is unable to work (its goal is to
generate "TeX-command-and-group-aware" differences between LaTeX
documents).

[1] <https://github.com/ftilmann/latexdiff/issues/61>.

[2] 
<https://www.tug.org/svn/texlive/trunk/Master/texmf-dist/scripts/latexdiff/latexdiff.pl?view=log>.

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