new gtk os/2 funcs

[Tor Lillqvist <tml iki fi>]

Jeff Garzik writes:
 > Are these candidates for glib?

 >         * gtk/gtkmain.c (add_dll_suffix): Add this function (OS/2 ver.)
 >         Added function gen_8_3_dll_name(gchar *name, gchar *fullname).

This is exactly the functionality that gmodule's g_module_build_path
should provides. In fact, in my yet-to-be-merged Win32 version of
gtkmain.c and gtkthemes.c, I use that function (without any need for
#ifdefs) to build the name of the module's .so or .dll file.

--tml