[Po4a-devel]Simplify the tag kind verification

[Francois Gouget]

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set_tags_kind() uses this code to verify the tag kind:

    if ($_ ne 'translate' && $_ ne 'empty' && $_ ne 'verbatim'  && $_ ne 'ignore' && $_ ne 'indent');

This seemed pretty long and unclear so I changed it to the equivalent:

    if ($_ !~ /^(translate|empty|verbatim|ignore|indent)$/);

Which I feel is more compact, readable and maintainable. But as I said 
the two are functionally equivalent so it's partly a matter of taste. 
Anyway, here's the patch.


Changelog:

  * po4a/lib/Locale/Po4a/Sgml.pm

    Francois Gouget <fgouget@free.fr>
    Use a regular expression to simplify the tag kind check.

-- 
Francois Gouget         fgouget@free.fr        http://fgouget.free.fr/
Nouvelle version : les anciens bogues ont \xE9t\xE9 remplac\xE9s par de nouveaux.
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