* AssemblyInfo.cs.in: kill keyfile attr
* Makefile.am: moved mono.snk to cairo dir
* Makefile.include: no need to copy snk into builddir any longer.
* cairo/AssemblyInfo.cs: kill keyfile attr
* cairo/Makefile.am: snk relocated into here. use it directly.
* glib/Makefile.am: no need to copy snk into builddir any longer.
* gtkdotnet/Makefile.am: no need to copy snk into builddir any longer.