Issue #85: Update bundled zlib library to zlib 1.2.8.
Issue #85: Fix zlib 1.2.8 compilation on Windows.
Issue #85: On Windows Use workaround for unicode paths only for Python 2.
Issue 85: On Windows override PATH_MAX constant.
Issue 85: For bootloader set default Windows version WinXP SP2.
Issue 85: In bootloader drop checking if OS is WinXP.