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

• NEW_ENV_VALUE bsd/include/arpa/telnet.h:259
• NEW_ENV_VAR bsd/include/arpa/telnet.h:258
• NOP bsd/include/arpa/telnet.h:77
• NSLC bsd/include/arpa/telnet.h:221
• NTELOPTS bsd/include/arpa/telnet.h:146