BUILD/MINOR: cpuset FreeBSD 14 build fix.

The 14th release started to introduce api compatibility layer with Linux
for the cpuset part and doing so irrevocably change the CPU* macros as well.
diff --git a/include/haproxy/cpuset-t.h b/include/haproxy/cpuset-t.h
index b26da72..5f812aa 100644
--- a/include/haproxy/cpuset-t.h
+++ b/include/haproxy/cpuset-t.h
@@ -24,7 +24,12 @@
 #elif defined(__FreeBSD__) || defined(__NetBSD__)
 
 # define CPUSET_REPR cpuset_t
-# define CPUSET_USE_FREEBSD_CPUSET
+
+# if defined(__FreeBSD__) && __FreeBSD_version >= 1400046
+#  define CPUSET_USE_CPUSET
+# else
+#  define CPUSET_USE_FREEBSD_CPUSET
+# endif
 
 #elif defined(__APPLE__)