boxed re-registration key freeing

With the current cvs the below gets an error,

    type Gtk2::Border is not registered with Glib-Perl at line 8.

Chasing it down in gdb it looks like Gtk2.xs register.xsh registers
Gtk2::Border with gperl_register_boxed, and then the Gtk2::Entry boot
code re-registers it.  On that second registration the info_by_gtype
update frees the boxed_info of the first registration, but the package
name string "Gtk2::Border" in that boxed_info is still in use as the key
in info_by_package.  Changing g_hash_table_insert to
g_hash_table_replace to update the key in info_by_package seems to do
the trick.

The GType of GtkBorder is unchanging, so the info_by_gtype doesn't care
between _insert or _replace, if I'm not mistaken.

Is GtkEntry.xs meant to register Gtk2::Border, or can it be left to

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Attachment: GBoxed.xs.boxed-reregister.diff
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