(posix_fileno) [_WIN32]: Rename posix_fileno() to fileno().

Remove the extern posix_fileno().

(fileno) [_WIN32]: Replace system fileno() with a function that supports posix
file descriptors.  Move #undef fileno to w32misc.h as the system define
is in stdio.h.

(rea) [_WIN32]: Add stdio.h for fileno() extern declaration and add misc.h
to ensure the WIN32 fixes to stdio.h are included.

src/lib/commands/rea.c

@@ -36,8 +36,10 @@
 #include <config.h>
 
 #include <ctype.h>
+#include <stdio.h>
 #include "commands.h"
 #include "match.h"
+#include "misc.h"
 #include "optlist.h"
 #include "tel.h"