I'm used to build the libcurl.dll that is bundled with dmd, but now I will move so a new libcurl.dll builder is needed.

Task:
- watch https://curl.haxx.se/download.html
- when a new version is released, build libcurl.dll & libcurl.lib (32 & 64 bit). see [1]
- make a .zip, upload it to the internet and make a pull request like this one https://github.com/dlang/installer/pull/210

[1] https://wiki.dlang.org/Curl_on_Windows#Building_libcurl.dll_on_Windows