[PATCH lttng-tools] fix: build with urcu 0.15 on 32bit archs with 64bit time_t
In the health check code we use a 'struct timespec' which has a 'tv_sec' member of type 'time_t'. On 32 bit architectures, this type has traditionnaly been 32bit but is currently being transitioned to 64bit on major distributions to handle y2k38.
We set this 64bit member with an urcu atomic operation which is technically not supported on most 32bit architectures but would still build with previous userspace-rcu versions. Starting with 0.15 these atomic set operations are handled with compiler atomic builtins which will use a support library with spinlocks when atomic operations for a type are unavailable. This results in a build failure because we don't link with this support library.
The good news is that we don't need to use atomic operations to initialize the health state since this happens before it is added to the global TLS state list.
