We have been using the microhttpd library as one of our dependencies for ARM and for a long time have been using a pre-build binary. We would like to move to a model of continuous updates and for that purpose I already submitted a VCPKG port patch to enable the ARM build for Windows
[libmicrohttpd] Add support for Windows ARM builds by anmatako · Pull Request #31088 · microsoft/vcpkg (github.com). However, it seems that the change could be done directly to the microhttpd library instead of VCPKG. Let me know if you're willing to take such a change on your end. I can prepare the change and submit a PR if you let me know where is the right avenue to do so.