Update some bundled win32 libs

[Raymond]

• update libxml2 to 2.9.3
  • see security and bugfixes on: ​​http://xmlsoft.org/news.html
• update boost to version 1.57
  • Changelog: ​http://www.boost.org/doc/libs/1_57_0/libs/log/doc/html/log/changelog.html
  • see: sourceforge.net/projects/boost/files/boost-binaries/

forum thread: http://www.wildfiregames.com/forum/index.php?showtopic=19428

[historic_bruno]

Some of these have separate tickets that I'm going to close and point back here for organization purposes.

[historic_bruno]

Separate ticket for specific OpenAL Soft bugfix: #3100

[leper]

We currently ship ICU 52, while the last release is 55. (Which includes some language names for eg Gaelic (which is included in release bundles). See ​http://wildfiregames.com/forum/index.php?showtopic=19826.

[historic_bruno]

r16515 updated Gloox to 1.0.13.

[ben]

In 17280:

Updates precompiled win32 libpng to 1.6.19, built with VC++ 2013 (v120_xp toolset), refs #3004.
Rebuilds zlib with VC++ 2013.

[Raymond]

please update libcurl to 7.45.0 wich fixed some CVE (in 7.43.0)

[ben]

In 17354:

Updates precompiled win32 libcurl to v7.45.0, built with VC++ 2013 (v120_xp toolset) and no SSL/zlib support, refs #3004

[ben]

In 17659:

Updates precompiled win32 ICU to 56.1, built with VC++ 2013 (XP toolset). Refs #3004