Release 1.2.0 // unable to compile with MSVS 2015 / CMake

[snikulov]

MSVS 2015 compilation error

C:\WORK\GitHub\log4cplus\include\log4cplus/internal/socket.h(88): error C3861: FreeAddrInfoW: identifier not found

The problem is related to https://github.com/log4cplus/log4cplus/blob/REL_1_2_0/CMakeLists.txt#L73

set(_WIN32_WINNT 0x0500 CACHE STRING "Define Windows API version to use.")

Must be at least 0x0502, because this function available in Windows XP SP 2.

Or greater (Vista - 0x0600) as on master branch

[wilx]

Good catch. I am bumping it up to 0x502.

[wilx]

This hopefully fixes it.