Update manpages for r250887.

Remove the lists of unneeded header files.

Requested by:	eadler

lib/libc/gen/fts.3

@@ -28,7 +28,7 @@
 .\"     @(#)fts.3	8.5 (Berkeley) 4/16/94
 .\" $FreeBSD$
 .\"
-.Dd March 18, 2012
+.Dd May 21, 2013
 .Dt FTS 3
 .Os
 .Sh NAME
@@ -37,8 +37,6 @@
 .Sh LIBRARY
 .Lb libc
 .Sh SYNOPSIS
-.In sys/types.h
-.In sys/stat.h
 .In fts.h
 .Ft FTS *
 .Fn fts_open "char * const *path_argv" "int options" "int (*compar)(const FTSENT * const *, const FTSENT * const *)"

lib/libc/net/getifaddrs.3

@@ -24,15 +24,13 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 12, 1995
+.Dd May 21, 2013
 .Dt GETIFADDRS 3
 .Os
 .Sh NAME
 .Nm getifaddrs
 .Nd get interface addresses
 .Sh SYNOPSIS
-.In sys/types.h
-.In sys/socket.h
 .In ifaddrs.h
 .Ft int
 .Fn getifaddrs "struct ifaddrs **ifap"

lib/libc/net/getifmaddrs.3

@@ -20,15 +20,13 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd November 14, 2003
+.Dd May 21, 2013
 .Dt GETIFMADDRS 3
 .Os
 .Sh NAME
 .Nm getifmaddrs
 .Nd get multicast group memberships
 .Sh SYNOPSIS
-.In sys/types.h
-.In sys/socket.h
 .In ifaddrs.h
 .Ft int
 .Fn getifmaddrs "struct ifmaddrs **ifmap"