graphics/cairo: define _WITH_CPU_SET_T to fix build on -CURRENT

Changes in 90fa9705d5cd hide functionality behind _WITH_CPU_SET_T,
and require consumers to opt-in.

Error:

• cairo-perf-micro.o ---

cairo-perf-micro.c:418:5: error: unknown type name 'cpu_set_t'; did you mean 'cpusetid_t'?

	    cpu_set_t affinity;
	    ^~~~~~~~~
	    cpusetid_t

/usr/include/sys/types.h:86:22: note: 'cpusetid_t' declared here
typedef __cpusetid_t cpusetid_t;

^

PR: 259787