Defines starting with `l' in bsd/include/arpa

• LFLOW_OFF bsd/include/arpa/telnet.h:174
• LFLOW_ON bsd/include/arpa/telnet.h:175
• LFLOW_RESTART_ANY bsd/include/arpa/telnet.h:176
• LFLOW_RESTART_XON bsd/include/arpa/telnet.h:177
• LM_FORWARDMASK bsd/include/arpa/telnet.h:184
• LM_MODE bsd/include/arpa/telnet.h:183
• LM_SLC bsd/include/arpa/telnet.h:185