* [capnproto] Remove vcpkg_fail_port_install.
The portfile and vcpkg.json disagreed.
```
vcpkg.json: !uwp & !((arm | arm64) & windows)
portfile: !uwp & (!windows | !(arm | arm64))
```
If we demorgan the supports expression once they agree:
```
!uwp & (!(arm | arm64) | !windows)
```
Also, arm64 implies arm:
```
!uwp & (!arm | !windows)
```
In support of https://github.com/microsoft/vcpkg/pull/21502
* Put the supports expression into DNF as suggested by @strega-nil.
* [many ports] call vcpkg_fixup_pkgconfig()
The ports generate pc files, but don't call vcpkg_fixup_pkgconfig() so that there are absolute paths in the pc files
* Update port-version for armadillo and polyclipping.
* Update version database.
Co-authored-by: Billy Robert O'Neal III <bion@microsoft.com>