Package: src:samba Version: 2:4.19.5+dfsg-1 <wbclient.h> interface defines quite some structs and functions to communicate with winbind. However, it does not define WinNT status codes, used, for example, in wbcAuthErrorInfo:nt_status. Without these, the code can not know actual reason of the error, and can't handle it properly.
NT STATUS codes are declared in code/ntstatus.h. However, this file declares a few other functions which are internal to samba. So it isn't possible to just move that file to another package. /mjt