GLIB, libffi and Windows

[Kean Johnston <kean johnston gmail com>]

I am trying to compile master on Windows. gclosure.c doesn't compile due to 
not having ffi.h. The presence of this is not tested in configure, and 
there is no mention of it being a requirement in INSTALL. Having taken a 
look at the offending file would it be a big loss if we just didn't provide 
g_cclosure_marshal_generic() on Win32? Is this dependency on yet another 
external library really worth it? It's adoption can't be that great as even 
of several of my fairly modern Linux systems there is no libffi.

Alternatively, if this is somehow now critical to glib can libffi be made a 
part of glib like PCRE is?

Kean