GDB debugger does not use the Windows ConPTY API in lieu of openpty API

[DrChat]

On Windows, attempting to use any GDB debugger results in an UnsatisfiedLinkError when Ghidra attempts to link to the system's openpty API.
This is because Windows does not have an openpty API.

However, Windows does have an equivalent API called ConPTY, which can be used in the same manner as Linux's PTY.
This is a usage example of the new API.

As such, it should be possible to abstract out the openpty and ConPTY APIs into a generic platform-independent interface and use that on both platforms.