dist/IO: move binmode from IO::File to IO::Handle

since you can binmode() any handle.

Fixes Perl#17457 which is most of this change, I only added tests, such
as they are.

MANIFEST

@@ -4283,6 +4283,7 @@ dist/IO/t/io_dup.t			See if dup()-related methods from IO work
 dist/IO/t/io_file.t			See if binmode()-related methods on IO::File work
 dist/IO/t/io_file_export.t		Test IO::File exports
 dist/IO/t/io_getline.t			Test getline and getlines
+dist/IO/t/io_handle.t			Test non-XS IO::Handle methods available
 dist/IO/t/io_leak.t			See if IO leaks SVs (only run in core)
 dist/IO/t/io_linenum.t			See if I/O line numbers are tracked correctly
 dist/IO/t/io_multihomed.t		See if INET sockets work with multi-homed hosts

dist/IO/lib/IO/File.pm

@@ -93,14 +93,6 @@ it passes all the three arguments to the three-argument C<open> operator.
 For convenience, C<IO::File> exports the O_XXX constants from the
 Fcntl module, if this module is available.
 
-=item binmode( [LAYER] )
-
-C<binmode> sets C<binmode> on the underlying C<IO> object, as documented
-in C<perldoc -f binmode>.
-
-C<binmode> accepts one optional parameter, which is the layer to be
-passed on to the C<binmode> call.
-
 =back
 
 =head1 NOTE
@@ -186,17 +178,4 @@ sub open {
     open($fh, $file);
 }
 
-################################################
-## Binmode
-##
-
-sub binmode {
-    ( @_ == 1 or @_ == 2 ) or croak 'usage $fh->binmode([LAYER])';
-
-    my($fh, $layer) = @_;
-
-    return binmode $$fh unless $layer;
-    return binmode $$fh, $layer;
-}
-
 1;

dist/IO/lib/IO/Handle.pm

@@ -191,6 +191,14 @@ current setting if C<BOOL> is not given.
 
 If an error occurs C<blocking> will return undef and C<$!> will be set.
 
+=item binmode( [LAYER] )
+
+C<binmode> sets C<binmode> on the underlying C<IO> object, as documented
+in C<perldoc -f binmode>.
+
+C<binmode> accepts one optional parameter, which is the layer to be
+passed on to the C<binmode> call.
+
 =back
 
 
@@ -628,4 +636,17 @@ sub printflush {
     }
 }
 
+################################################
+## Binmode
+##
+
+sub binmode {
+    ( @_ == 1 or @_ == 2 ) or croak 'usage $fh->binmode([LAYER])';
+
+    my($fh, $layer) = @_;
+
+    return binmode $$fh unless $layer;
+    return binmode $$fh, $layer;
+}
+
 1;

dist/IO/t/io_handle.t

@@ -0,0 +1,12 @@
+#!./perl -w
+
+use strict;
+require($ENV{PERL_CORE} ? "../../t/test.pl" : "./t/test.pl");
+
+plan(tests => 2);
+
+use_ok("IO::Handle");
+my $io = IO::Handle->new;
+
+can_ok($io, qw(fdopen close opened fileno getc eof print printf say truncate read),
+            qw(sysread write syswrite stat autoflush binmode fcntl ioctl));