Update transifex-client to 0.9, fixing CVE-2013-2073.

pkgsrc changes; use wget instead of curl to fetch.

Quote from release announce on the blog.

* Verify SSL certificates. Even though the client opened an encrypted
  connection to the server, it did not validate the certificate used. As a
  result, the client was open to MITM attacks. The new version will always
  validate the certificate first and refuse to connect to the server if there
  is a problem with it.

* Add support for soft links in UNIX systems. You can now use soft links in
  your project directories. This would be useful in cases where you have a
  large project and you would prefer to assign the localization files to
  multiple Transifex projects.

* Add support for local .transifexrc files. You can now have a .transifexrc
  file in your project directory. The entries in the file will override the
  ones from the main one. This would be useful in cases you would prefer to
  use a different set of credentials for a project than the ones you use for
  the rest of your projects in Transifex.

* Make the client more friendly to users in Windows. The .tx/config file now
  supports forward slashes for the paths in Windows, in accordance to what
  UNIX uses. As a result, people can now share a .tx/config irrespective of
  whether they use a UNIX-based system (like Linux and Mac OS X) or Windows.
Note update of devel/transifex-client package to 0.9.
Fix various prototypes and missing inclueds.
Fix missing includes. Don't forward define std::less.
Add Contao 3.1.0 support.
Resolve hash ambiguity for C++11 STL. Add missing includes. Add missing
RCS id.
Casting 0 to an iterator is not portable. Just use end() in that case.
Only compile source files.
remove obsolete libevent interface uses
Fix egg usage.
Fix build of freeciv-server with newer libtool.
Add missing includes to fail again at the missing header.
Fix operators to be constant.
Adding contao31 package version 3.1.0 (Contao 3.1.0).

This is various improved version from Contao 3.0.  Please refer changes to
<https://contao.org/en/news/contao-3_1_0.html>.
Fix missing includes.
Dance the Doxygen!
Adding contao31-example package version 3.1.0.

This is example site data for contao31 package.
Drop unused member variable.
Add and enable contao31 and contao31-example.
Use bool conversion operator to check for defined. More compatible
version of the original nullptr fix.