Samba 4.0 support

Samba 4.0 support and some refactoring in VFS module.

* **/samba-module/vfs_greyhole-samba-4.0.c** - small changes required to move from *samba 3.6* to *samba 4.0*. Formatted printing to spool files moved to separate function.
* **/samba-module/wscript-samba-4.0.patch** - patches *samba/source3/wscript* and *samba/source3/modules/wscript_build* to build module.
* **/samba-module/bin/4.0/greyhole-x86_64.so** - x86_64 binary;