BUILD: Makefile: add the USE_QUIC option to make help

Add the missing "USE_QUIC" option to `make help`.

Must be backported as far as 2.4.

(cherry picked from commit 1b5f9de1b42d43cdd269690328fbb33875c93a8c)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed