[dbus] reopen #43993, build fails if VCPKG_ROOT starts with `/opt`

### Operating system

Ubuntu 22.04.5

### Compiler

_No response_

### Steps to reproduce the behavior

```Shell
`./vcpkg install dbus`

See #43993.

The bug was not fixed. But only happens if `vcpkg` root path starts with `/opt/`.
```

### Failure logs

See #43993

### Additional context

_No response_