Both gdb and lldb interrupt execution after attaching to the process, so
no need to send a SIGTRAP immediately after which would require typing
`continue` in the debugger twice.
This is a remnant from SerenityOS. Let's avoid confusion as to why we
negate errno when we call Error::from_syscall just to negate it again
when we store the error code.
Windows doesn't have a concept of zombie children, hence:
* `disown` not needed
* we need a process handle because otherwise if the process have ended
by the time `wait_for_termination` is called
its pid may be reassigned to other process
