Remove obsolete comments about iconv on Windows.

Author: kevinbackhouse

README.md

@@ -296,12 +296,6 @@ CMake will detect libiconv of all UNIX like systems including Linux, macOS, UNIX
 
 The library libiconv is a GNU library and we do not recommend using libiconv with Exiv2 when building with Visual Studio.
 
-Exiv2 includes the file cmake/FindIconv.cmake which contains a guard to prevent CMake from finding libiconv when you build with Visual Studio.  This was added because of issues reported when Visual Studio attempted to link libiconv libraries installed by Cygwin, or MinGW or gnuwin32. [https://github.com/Exiv2/exiv2/issues/1250](https://github.com/Exiv2/exiv2/issues/1250)
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-There are build instructions about Visual Studio in libiconv-1.16/INSTALL.window require you to install Cygwin.  There is an article here about building libiconv with Visual Studio. [https://www.codeproject.com/Articles/302012/How-to-Build-libiconv-with-Microsoft-Visual-Studio](https://www.codeproject.com/Articles/302012/How-to-Build-libiconv-with-Microsoft-Visual-Studio).
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-If you wish to use libiconv with Visual Studio you will have to build libiconv and remove the "guard" in cmake/FindIconv.cmake.  Team Exiv2 will not provide support concerning libiconv and Visual Studio.
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