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

This remove any name conflicts, especially on Solaris.
diff --git a/src/ev_epoll.c b/src/ev_epoll.c
index 65e5164..602a243 100644
--- a/src/ev_epoll.c
+++ b/src/ev_epoll.c
@@ -71,14 +71,14 @@
 		if (!fdtab[fd].owner)
 			continue;
 
-		SPIN_LOCK(FD_LOCK, &fdtab[fd].lock);
+		HA_SPIN_LOCK(FD_LOCK, &fdtab[fd].lock);
 		fdtab[fd].updated = 0;
 		fdtab[fd].new = 0;
 
 		eo = fdtab[fd].state;
 		en = fd_compute_new_polled_status(eo);
 		fdtab[fd].state = en;
-		SPIN_UNLOCK(FD_LOCK, &fdtab[fd].lock);
+		HA_SPIN_UNLOCK(FD_LOCK, &fdtab[fd].lock);
 
 		if ((eo ^ en) & FD_EV_POLLED_RW) {
 			/* poll status changed */