Blender Git Loki

Codesign: Possible fix for stamp appearing prior to archive

From looking into builder's logs it seems that stamp file is picked
up prior to actual archive: sometimes worker reports missing archive
file, from a code path which is only possible if there is a stamp file.

Could be something with IO scheduling where bigger file is sent to
Samba server after smaller file.

Hopefully with this change this will not happen anymore.