libiconv port

[emmatyping]

As part of #34, a libiconv port is needed first. Sadly, the GNU folks decided to remove support for MSVC. As I see it, a patch that adds cmake or vcxproj files for the library are needed. There is an issue on the GNU issues which has a VS10 sln, but there are cmake-ified versions of the latest libiconv, which seem cleaner than using MSVC build files.

[ras0219-msft]

Hmm, this is unfortunate. Please take whichever path you find most productive; as a general guideline we'd prefer using the original sources and only the linked repository's CMakeLists.txt/sln to make it easier for others to trust the port.

[emmatyping]

as a general guideline we'd prefer using the original sources and only the linked repository's CMakeLists.txt/sln to make it easier for others to trust the port.

I agree that using the original build system is preferable, but libiconv uses configure and automake, which I don't think can be used with MSVC, so I was thinking we'd ship the original + a patch that adds cmake files to build libiconv.

[Orvid]

Might be worth looking at the build setup for some of PHP's dependencies on windows: https://github.com/winlibs/ iconv is included.

[emmatyping]

@Orvid I've seen that, and considered it. But it makes more sense to me for use to use a CMake based system, so instead of maintaining 4+ solutions, there is just one cmake file, which can build for whichever VS version you need.

[emmatyping]

Since #118 is merged, I am going to close this.