[MINOR] use 'is_set' instead of 'isset' in struct poller

'isset' was defined as a macro in /usr/include/sys/param.h, and
it breaks build on at least OpenBSD.
diff --git a/include/proto/fd.h b/include/proto/fd.h
index be52612..9b4c632 100644
--- a/include/proto/fd.h
+++ b/include/proto/fd.h
@@ -53,7 +53,7 @@
 
 #define EV_FD_SET(fd, ev)    (cur_poller.set((fd), (ev)))
 #define EV_FD_CLR(fd, ev)    (cur_poller.clr((fd), (ev)))
-#define EV_FD_ISSET(fd, ev)  (cur_poller.isset((fd), (ev)))
+#define EV_FD_ISSET(fd, ev)  (cur_poller.is_set((fd), (ev)))
 #define EV_FD_COND_S(fd, ev) (cur_poller.cond_s((fd), (ev)))
 #define EV_FD_COND_C(fd, ev) (cur_poller.cond_c((fd), (ev)))
 #define EV_FD_REM(fd)        (cur_poller.rem(fd))
diff --git a/include/types/fd.h b/include/types/fd.h
index 2128cb9..68335c0 100644
--- a/include/types/fd.h
+++ b/include/types/fd.h
@@ -2,7 +2,7 @@
   include/types/fd.h
   File descriptors states.
 
-  Copyright (C) 2000-2006 Willy Tarreau - w@1wt.eu
+  Copyright (C) 2000-2007 Willy Tarreau - w@1wt.eu
   
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
@@ -73,7 +73,7 @@
  */
 struct poller {
 	void   *private;                                     /* any private data for the poller */
-	REGPRM2 int   (*isset)(const int fd, int dir);       /* check if <fd> is being polled for dir <dir> */
+	REGPRM2 int  (*is_set)(const int fd, int dir);       /* check if <fd> is being polled for dir <dir> */
 	REGPRM2 int     (*set)(const int fd, int dir);       /* set   polling on <fd> for <dir> */
 	REGPRM2 int     (*clr)(const int fd, int dir);       /* clear polling on <fd> for <dir> */
 	REGPRM2 int  (*cond_s)(const int fd, int dir);       /* set   polling on <fd> for <dir> if unset */
diff --git a/src/ev_epoll.c b/src/ev_epoll.c
index 482ddc0..6931a0c 100644
--- a/src/ev_epoll.c
+++ b/src/ev_epoll.c
@@ -49,7 +49,7 @@
  * instead of the usual macros improve the FD_* performance by about 80%,
  * and that marking them regparm(2) adds another 20%.
  */
-REGPRM2 static int __fd_isset(const int fd, int dir)
+REGPRM2 static int __fd_is_set(const int fd, int dir)
 {
 	return FD_ISSET(fd, fd_evts[dir]);
 }
@@ -308,7 +308,7 @@
 	p->init = epoll_init;
 	p->term = epoll_term;
 	p->poll = epoll_poll;
-	p->isset = __fd_isset;
+	p->is_set = __fd_is_set;
 	p->set = __fd_set;
 	p->clr = __fd_clr;
 	p->rem = __fd_rem;
diff --git a/src/ev_kqueue.c b/src/ev_kqueue.c
index b3510f3..3984588 100644
--- a/src/ev_kqueue.c
+++ b/src/ev_kqueue.c
@@ -54,7 +54,7 @@
 /*
  * Returns non-zero if direction <dir> is already set for <fd>.
  */
-REGPRM2 static int __fd_isset(const int fd, int dir)
+REGPRM2 static int __fd_is_set(const int fd, int dir)
 {
 	return FD_ISSET(fd, fd_evts[dir]);
 }
@@ -220,7 +220,7 @@
 	p->term = kqueue_term;
 	p->poll = kqueue_poll;
 
-	p->isset  = __fd_isset;
+	p->is_set  = __fd_is_set;
 	p->cond_s = p->set = __fd_set;
 	p->cond_c = p->clr = __fd_clr;
 	p->clo    = p->rem = __fd_rem;
diff --git a/src/ev_poll.c b/src/ev_poll.c
index 235772d..06adeb4 100644
--- a/src/ev_poll.c
+++ b/src/ev_poll.c
@@ -37,7 +37,7 @@
  * instead of the usual macros improve the FD_* performance by about 80%,
  * and that marking them regparm(2) adds another 20%.
  */
-REGPRM2 static int __fd_isset(const int fd, int dir)
+REGPRM2 static int __fd_is_set(const int fd, int dir)
 {
 	return FD_ISSET(fd, fd_evts[dir]);
 }
@@ -216,7 +216,7 @@
 	p->init = poll_init;
 	p->term = poll_term;
 	p->poll = poll_poll;
-	p->isset = __fd_isset;
+	p->is_set = __fd_is_set;
 	p->set = __fd_set;
 	p->clr = __fd_clr;
 	p->clo = p->rem = __fd_rem;
diff --git a/src/ev_select.c b/src/ev_select.c
index dc43b5e..c5dbedf 100644
--- a/src/ev_select.c
+++ b/src/ev_select.c
@@ -34,7 +34,7 @@
  * instead of the usual macros improve the FD_* performance by about 80%,
  * and that marking them regparm(2) adds another 20%.
  */
-REGPRM2 static int __fd_isset(const int fd, int dir)
+REGPRM2 static int __fd_is_set(const int fd, int dir)
 {
 	return FD_ISSET(fd, fd_evts[dir]);
 }
@@ -216,7 +216,7 @@
 	p->init = select_init;
 	p->term = select_term;
 	p->poll = select_poll;
-	p->isset = __fd_isset;
+	p->is_set = __fd_is_set;
 	p->set = __fd_set;
 	p->clr = __fd_clr;
 	p->clo = p->rem = __fd_rem;