Adding Windows Build Support

[bannsec]

Hey,

So I've made a few changes so that this will build and load in Windows. I've verified that it works in Python-64 installing into a virtualenv on my Windows 7x64 box. Couple things to note:

• I changed the vex file to be vex.orig. I'm not sure what the vex file was used for, but in the Windows build it confuses it. If I'm reading the build python correctly, Linux/Mac should still build fine without that symlink, but I may be mis-understanding.
• I had to make an assumption of a standard Cygwin64 build environment for Windows. MinGW wouldn't build 64-bit and MinGW-64 wouldn't build properly at all. Also, on the windows side the build will pull the cygwin1.dll file from \Cygwin64\bin.
• Build still fails in general on Windows due to capstone, but I'm looking at the one separately. If the builder just removes the archinfo dependency, then it will build and the user can build the archinfo and capstone separately.
• I included a link to my github repo for wheel files I'm making. Let me know how you would like to handle those things in the future. Windows is a pain to build for, so I'd expect the wheel files are going to be the preferred way to install.