Fix errno conflict

Newlib defines errno as

	#define errno (*__errno())

In case this is expanded in a function parameter, e.g.

	void f(int errno) { ... }

then we have a function pointer parameter instead of the integer scalar.

freebsd/sys/netinet/in_pcb.c

@@ -33,6 +33,10 @@
  *	@(#)in_pcb.c	8.4 (Berkeley) 5/24/95
  */
 
+#ifdef __rtems__
+#include <errno.h>
+#undef errno
+#endif /* __rtems__ */
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 

freebsd/sys/netinet/in_pcb.h

@@ -503,13 +503,8 @@ struct inpcb *
 struct inpcb *
 	in_pcblookup_hash(struct inpcbinfo *, struct in_addr, u_int,
 	    struct in_addr, u_int, int, struct ifnet *);
-#ifndef __rtems__
 void	in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr,
 	    int, struct inpcb *(*)(struct inpcb *, int));
-#else
-void  in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
-    struct inpcb *(*notify)(struct inpcb *, int));
-#endif
 void	in_pcbref(struct inpcb *);
 void	in_pcbrehash(struct inpcb *);
 int	in_pcbrele(struct inpcb *);

freebsd/sys/netinet/tcp_subr.c

@@ -31,6 +31,10 @@
  *	@(#)tcp_subr.c	8.2 (Berkeley) 5/24/95
  */
 
+#ifdef __rtems__
+#include <errno.h>
+#undef errno
+#endif /* __rtems__ */
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 

freebsd/sys/netinet/tcp_var.h

@@ -590,13 +590,8 @@ int	 tcp_twrecycleable(struct tcptw *tw);
 void	 tcp_twclose(struct tcptw *_tw, int _reuse);
 void	 tcp_ctlinput(int, struct sockaddr *, void *);
 int	 tcp_ctloutput(struct socket *, struct sockopt *);
-#ifndef __rtems__
 struct tcpcb *
 	 tcp_drop(struct tcpcb *, int);
-#else
-struct tcpcb *
-tcp_drop(struct tcpcb *tp, int errno);
-#endif
 void	 tcp_drain(void);
 void	 tcp_init(void);
 #ifdef VIMAGE
@@ -619,17 +614,10 @@ u_long	 tcp_maxmtu6(struct in_conninfo *, int *);
 void	 tcp_mss_update(struct tcpcb *, int, struct hc_metrics_lite *, int *);
 void	 tcp_mss(struct tcpcb *, int);
 int	 tcp_mssopt(struct in_conninfo *);
-#ifndef __rtems__
 struct inpcb *
 	 tcp_drop_syn_sent(struct inpcb *, int);
 struct inpcb *
 	 tcp_mtudisc(struct inpcb *, int);
-#else
-struct inpcb *
-tcp_drop_syn_sent(struct inpcb *inp, int errno);
-struct inpcb *
-tcp_mtudisc(struct inpcb *inp, int errno);
-#endif
 struct tcpcb *
 	 tcp_newtcpcb(struct inpcb *);
 int	 tcp_output(struct tcpcb *);

freebsd/sys/netinet/udp_usrreq.c

@@ -33,6 +33,10 @@
  *	@(#)udp_usrreq.c	8.6 (Berkeley) 5/23/95
  */
 
+#ifdef __rtems__
+#include <errno.h>
+#undef errno
+#endif /* __rtems__ */
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 

freebsd/sys/netinet/udp_var.h

@@ -91,6 +91,10 @@ struct udpstat {
 };
 
 #ifdef _KERNEL
+#ifdef __rtems__
+#include <errno.h>
+#undef errno
+#endif /* __rtems__ */
 /*
  * In-kernel consumers can use these accessor macros directly to update
  * stats.

freebsd/sys/netinet6/in6_pcb.c

@@ -62,6 +62,10 @@
  *	@(#)in_pcb.c	8.2 (Berkeley) 1/4/94
  */
 
+#ifdef __rtems__
+#include <errno.h>
+#undef errno
+#endif /* __rtems__ */
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 

freebsd/sys/netinet6/in6_pcb.h

@@ -86,13 +86,8 @@ struct	inpcb *
 void	in6_pcbnotify __P((struct inpcbinfo *, struct sockaddr *,
 			   u_int, const struct sockaddr *, u_int, int, void *,
 			   struct inpcb *(*)(struct inpcb *, int)));
-#ifndef __rtems__
 struct inpcb *
 	in6_rtchange __P((struct inpcb *, int));
-#else
-struct inpcb *
-  in6_rtchange(struct inpcb *inp, int errno);
-#endif
 struct sockaddr *
 	in6_sockaddr __P((in_port_t port, struct in6_addr *addr_p));
 struct sockaddr *