Merge #16669: build: use new fork of osslsigncode for windows gitian signing

feb507577797518d0bee1774327d215e19d1ba34 build: use osslsigncode 2.0 in gitian (fanquake)

Pull request description:

  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 ](https://github.com/mtrojnar/osslsigncode/commit/36715c11836d07709aff822154a0eed2c43ed5a5) & [add the attach-signature command](https://github.com/mtrojnar/osslsigncode/commit/3be7eb1676a8af8afd9e0aa03e4cac651da14c23)) 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`](https://github.com/bitcoin/bitcoin/blob/master/contrib/windeploy/detached-sig-create.sh) script, as well as some review of the changes to `osslsigncode` itself. Hence WIP and chasing Concept ACKs / NACKs.

ACKs for top commit:
  MarcoFalke:
    Concept ACK feb507577797518d0bee1774327d215e19d1ba34 given that this upstream is now used in Ubuntu and Debian
  laanwj:
    ACK feb507577797518d0bee1774327d215e19d1ba34

Tree-SHA512: c48de6dc32751d96dd04b920bfacca40af47a2883330ba0700371d56c580a7e45cedd8d8a913709d56be036762b63cb1825a98cff7aa77b6d7804fab11220850

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