Log Message:
Update xmlsec1 to 1.2.16.

* May 26 2010
  Changes in XML Security Library 1.2.16 release:
    * New xmlsec-gcrypt library.
    * xmlsec-gcrypt: Added RSA with SHA1/SHA256/SHA384/SHA512/MD5/RIPEMD160, DSA
      with SHA1, AES/DES KW support.
    * xmlsec-gnutls: Added X509 support and converted the library to use xmlsec-
      crypt library for all crypto operations.
    * xmlsec-mscrypto: RSA/OAEP and AES/DES KW support.
    * Several minor bug fixes and code cleanups.
* April 29 2010
  Changes in XML Security Library 1.2.15 release:
    * xmlsec-mscrypto: Added HMAC with MD5, SHA1, SHA256/384/512; RSA with MD5,
      SHA256/384/512 support.
    * xmlsec-mscrypto: Converted to Unicode (the non-Unicode builds are still
      available as compile time option).
    * xmlsec-nss: Added MD5 and SHA256/384/512 support for digest, HMAC and RSA
      (the new minimum required version for NSS library is 3.9).
    * xmlsec-gnutls: Added SHA256/384/512 for digest and HMAC; MD5 and RIPEMD160
      digests support (the new minimum required version for GnuTLS library is
      2.8.0).
    * Fixed typo: "Copyrigth" should be "Copyright".
    * Several critical bug fixes and code cleanups.
* December 5 2009
  Changes in XML Security Library 1.2.14 release:
    * XMLSec library is switched from built-in LTDL library to the system LTDL
      library on Linux/Unix and native calls on Windows to fix security issue
       (CVE-2009-3736) in LTDL.
    * Fixed minor bugs (see log for complete list).