(Franck Joncourt) patch to address sprintf() warnings for issue #60
Fixes to get hmac_support and 2.5 changes working for the Windows lib and client builds.
Use inet_aton on Windows (Older windows versions do not have enet_ntop).
Tweaked WIN32 conditional for using inet_ntoa instead of inet_ntop to apply only to versions below Vista (WINVER <= 0x0600)
Copied the win32 Visual Studio solution and project files to preserve a VS 2008 version.
Merge branch 'win32_fixes' of ssh://github.com/mrash/fwknop into win32_fixes
Merge remote-tracking branch 'origin/win32_fixes'

This fixes issue #69 thanks to Damien.
Merge branch 'master' of github.com:mrash/fwknop