Macros starting with `z' in bsd/netat

• ZIP_ZIP bsd/netat/zip.h:65
• ZT_CLR_ZMAP bsd/netat/routing_tables.h:172
• ZT_ISIN_ZMAP bsd/netat/routing_tables.h:166
• ZT_SET_ZMAP bsd/netat/routing_tables.h:181