[PATCH] am_edit: support for vars in _SOURCES

[Aurelien Gateau]

Aurelien Gateau wrote:
 
> The attached patch is necessary for am_edit to properly expand $(gvcore).
> My knowledge of Perl and autotools is somewhat limited, but at least it
> works for me.

I hate doing this, but no one responded to my mail and I'm about to release
a new version of Gwenview. Is it ok if I commit this patch?

Regards,
  Aurélien