net/haproxy: fix build on -CURRENT

The CPU_SET macros in -CURRENT have been made compatible with GLIBC.
A simple test for the new signature of CPU_AND, CPU_OR, ... is the
existence of a CPU_ALLOC macro.

Approved by:    portmgr (implicit)
MFH:            2022Q1

net/haproxy/files/patch-src_cpuset.c

@@ -0,0 +1,14 @@
+--- src/cpuset.c.orig	2021-12-23 16:47:51 UTC
++++ src/cpuset.c
+@@ -53,7 +53,11 @@ void ha_cpuset_and(struct hap_cpuset *dst, const struc
+ 	CPU_AND(&dst->cpuset, &dst->cpuset, &src->cpuset);
+ 
+ #elif defined(CPUSET_USE_FREEBSD_CPUSET)
++#if defined(CPU_ALLOC)
++	CPU_AND(&dst->cpuset, &dst->cpuset, &src->cpuset);
++#else
+ 	CPU_AND(&dst->cpuset, &src->cpuset);
++#endif
+ 
+ #elif defined(CPUSET_USE_ULONG)
+ 	dst->cpuset &= src->cpuset;