NOT AN ISSUE : build on windows with cmake 3.4 and mingw32

[alfu32]

Actually not an issue but a solution :

Building with MinGW

> git clone https://github.com/creationix/dukluv.git
> cd dukluv
> git submodule init
> git submodule update
> mkdir build
> cd build
> cmake -G "MSYS Makefiles" ..
> mingw32-make