samba: update waf-as-source.patch to apply

* and Applying patch waf-as-source.patch
  ...
  File buildtools/bin/waf-svn is not empty after patch; not deleting
  ...
  Patch waf-as-source.patch does not apply (enforce with -f)
  I've dropped this chunk and now it builds

* there is also WARNING about unpackaged but empty base_sbindir
  WARNING: QA Issue: samba: Files/directories were installed but not
  shipped
    /sbin
  created by do_install in samba.inc but used only when cifs is built,
  maybe we should remove it from samba.inc now

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>