BUILD: threads: Rename SPIN/RWLOCK macros using HA_ prefix

This remove any name conflicts, especially on Solaris.
diff --git a/include/proto/session.h b/include/proto/session.h
index 3dead44..7f95e2a 100644
--- a/include/proto/session.h
+++ b/include/proto/session.h
@@ -57,11 +57,11 @@
 
 		ptr = stktable_data_ptr(stkctr->table, ts, STKTABLE_DT_CONN_CUR);
 		if (ptr) {
-			RWLOCK_WRLOCK(STK_SESS_LOCK, &ts->lock);
+			HA_RWLOCK_WRLOCK(STK_SESS_LOCK, &ts->lock);
 
 			stktable_data_cast(ptr, conn_cur)--;
 
-			RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
+			HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
 		}
 
 		stkctr_set_entry(stkctr, NULL);