180dc3c886 build: miniupnpc 2.2.2 (fanquake)
Pull request description:
Creating the dll subdir is no-longer required.
We can drop our wingen patch.
One issue that came up in [#19867](https://github.com/bitcoin/bitcoin/pull/19867#discussion_r483516359):
> unrelated to this change but: why are we inserting the architecture in here, seems like something not necessary to reveal
> My assumption is that it was being inserted to make depends more deterministic. However I think we can improve this, as there's no reason to reveal more of the version information either. Could leave the version as is /2.0 and either drop the architecture, or insert something else?
I've dropped our `sed` and added a patch that just removes the OS string and miniupnpc version from the User-Agent. i.e:
```bash
# master
strings depends/x86_64-apple-darwin19.6.0/lib/libminiupnpc.a | rg -i User-Agent
User-Agent: x86_64-apple-darwin19.6.0, UPnP/1.1, MiniUPnPc/2.0.20180203
User-Agent: x86_64-apple-darwin19.6.0, UPnP/1.1, MiniUPnPc/2.0.20180203
# this PR
strings depends/x86_64-apple-darwin19.6.0/lib/libminiupnpc.a | rg -i User-Agent
User-Agent: UPnP/1.1
User-Agent: UPnP/1.1
```
Note that built unmodified (22c1386351), the User-Agent would be:
```bash
strings libminiupnpc.dylib | rg User-Agent
User-Agent: Darwin/19.6.0, UPnP/1.1, MiniUPnPc/2.2.0
User-Agent: Darwin/19.6.0, UPnP/1.1, MiniUPnPc/2.2.0
```
ACKs for top commit:
laanwj:
Code review ACK 180dc3c886
hebasto:
ACK 180dc3c886.
Tree-SHA512: b0b6e623dbc5499e28faedf992d84278d6a11887a45a3806957b9e08886c5e56044cdfa2e7d7ec81cb1dd55f89be99834367905315d6bc611ba530e91d889ad1
fa2a5b8f3a