Makefile: build with -Wall
Makefile: build with -Wall

Signed-off-by: Joel Stanley <4816dabf8db1bc6cac35b3a24cab2ff844b5b0c7@jms.id.au>

causten/phosphor-host-ipmid,vishwabmc/phosphor-host-ipmid,shgoupf/phosphor-host-ipmid,openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid,vishwabmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid,causten/phosphor-host-ipmid,causten/phosphor-host-ipmid,shgoupf/phosphor-host-ipmid