CI: Remove a comment about a fixed warning

It is a follow-up to 5adcf64.

Author: fxlb

build.sh

@@ -38,7 +38,6 @@ case `cc_id`/`os_id` in
 tcc-*/*)
     # print-802_11.c:3317: warning: assignment discards qualifiers from pointer
     #   target type
-    # print-esp.c:373: warning: function might return no value: 'ldp_pdu_print'
     TCPDUMP_TAINTED=yes
     ;;
 *)