DEV: haring: automatically disable DEBUG_STRICT

DEV: haring: automatically disable DEBUG_STRICT

Ideally haring should be compiled with the same options as haproxy so
that ring headers have the same size (e.g. with/without locks, with/
without lock debugging). But when enabling DEBUG_STRICT, BUG_ON() is
enabled and breaks the build by making references to complain() and
ha_backtrace_to_stderr().

Let's just disable DEBUG_STRICT before opening include files. This is
sufficient to address the problem.

This may be backorted to older versions that include haring.