proc/native: fix Ctrl-C handling on non-headless instances on windows (#3039)
proc/native: fix Ctrl-C handling on non-headless instances on windows (#3039)

In non-headless instances Ctrl-C should pause the process, not
terminate it. To make this work on Windows we have to pass the
syscall.CREATE_NEW_PROCESS_GROUP flag to os.StartProcess.
go-delve/delve,go-delve/delve,go-delve/delve,go-delve/delve,go-delve/delve