This commit copies several source files around the Mozilla's online update
from the Mozilla sources to LibreOffice.  The hope is that we will be able to
modify it so that LibreOffice can use the same update mechanism as Firefox,
including downloading the packs on background, and applying them on the next
start.

changeset:   248917:ce863f9d8864

The following locations in the Mozzila sources were copied:

firefox/modules/libmar -> onlineupdate/source/libmar
firefox/toolkit/mozapps/update -> onlineupdate/source/update

JavaScript parts were omitted.

Change-Id: I0c92dc0bf734bfd5d8746822f674e162d64fa62f