[xmlsec] New xmlsec 1.2.20 release

[Aleksey Sanin]

The new XML Security Library 1.2.20 fixes a number of miscellaneous
bugs and updates expired or soon-to-be-expired certificates in the
test suite (see ChangeLog for more details).

You can find the new release in the usual place:

   http://www.aleksey.com/xmlsec/download.html

Thanks to everyone for contributing patches and reporting bugs!

Best,

Aleksey Sanin