[Minor] Oops, forgot to add library for linkage

CMakeLists.txt

@@ -1224,6 +1224,7 @@ LIST(APPEND RSPAMD_REQUIRED_LIBRARIES rspamd-hiredis)
 LIST(APPEND RSPAMD_REQUIRED_LIBRARIES rspamd-actrie)
 LIST(APPEND RSPAMD_REQUIRED_LIBRARIES rspamd-t1ha)
 LIST(APPEND RSPAMD_REQUIRED_LIBRARIES rspamd-ev)
+LIST(APPEND RSPAMD_REQUIRED_LIBRARIES rspamd-kann)
 
 IF(ENABLE_CLANG_PLUGIN MATCHES "ON")
 	ADD_SUBDIRECTORY(clang-plugin)