The function currently has 2 purposes: (1) To copy dependent dlls for
executables to output binary directory. This ensures that these helper
processes can be ran after a build given not all DLLs from vcpkg libs
get implicitly copied to the bin folder. (2) Allow fully background
and/or GUI processes to use the Windows Subsystem. This prevents
unnecessarily launching a console for the process, as we either require
no user interaction or the user interaction is all handled in the GUI.
Explicitly link final targets with OpenSSL to ensure that the vcpkg
version is loaded instead of the system one.
Before this change we would inherit `libcrypto.so` and `libssl.so` from
other dependencies, like Qt, that do not have their RPATH rewritten.
This would cause the loader to prefer the system libraries over the
vcpkg ones causing all sorts of version mismatch issues.
The effectiveness of this change can be verified with
`readelf -d ./bin/Ladybird` showing `libcrypto.so` and `libssl.so` as
direct dependencies, before they would not appear. Additionally, `ldd`
will show `libcrypto.so` and `libssl.so` pointing to the vcpkg builds.
