The original osslsigncode project, https://sourceforge.net/projects/osslsigncode, has been marked as abandonware:
This is now - and has been for a long while - abandonware. Feel free to create your own forks etc.".
However, a fork has emerged, https://github.com/mtrojnar/osslsigncode, that has incorporated theuni's patches (add the -pem option in extract-signature mode & add the attach-signature command) as well as updated the tool to work with OpenSSL 1.1 and other improvements.
This commit switches the windows signer descriptor to use this new version of osslsigncode.
I've tested using this new version of osslsigncode while doing a 0.18.1 gitian build, and it "seems" to work. However this needs a look over from Cory, to check if the tool is still compatible with his usage in the detached-sig-create.sh script, as well as some review of the changes to osslsigncode itself. Hence WIP and chasing Concept ACKs / NACKs.