Fix mingw Windows build
The NOGDI flag cause an error related to the mingw header file (https://sourceforge.net/p/mingw-w64/bugs/834/).
And zlib is not included in mingw's boost, and it doesn't seem like this is required?
The NOGDI flag cause an error related to the mingw header file (https://sourceforge.net/p/mingw-w64/bugs/834/).
And zlib is not included in mingw's boost, and it doesn't seem like this is required?