WinSCPDialogs.cpp: remove GSSAPIServerRealm
WinSCPDialogs.cpp: add options "Attempt GSSAPI authentication (SSH-2)" "Allow GSSAPI credential delegation"
WinSCPDialogs.cpp: add options "Attempt GSSAPI authentication (SSH-2)" "Allow GSSAPI credential delegation"; Remove option "Attempt GSSAPI/SSPI authentication (SSH-2)"