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

• LFLOW_OFF bsd/include/arpa/telnet.h:177
• LFLOW_ON bsd/include/arpa/telnet.h:178
• LFLOW_RESTART_ANY bsd/include/arpa/telnet.h:179
• LFLOW_RESTART_XON bsd/include/arpa/telnet.h:180
• LM_FORWARDMASK bsd/include/arpa/telnet.h:187
• LM_MODE bsd/include/arpa/telnet.h:186
• LM_SLC bsd/include/arpa/telnet.h:188