Log Message:
devel/libebml: update to 1.3.5

Released v1.3.5.
* The function EbmlMaster::CheckMandatory() will now only return
false if a mandatory element is missing for which there's no
default value in the specifications. This means that callers such
as EbmlMaster::UpdateSize() and by extension EbmlMaster::Render()
will not insist on all mandatory elements being present anymore,
but only those for which there's no default value.
* Added a template function `FindNextChild`. Patch by C.W. Betts.
* Fix reading and EBML element even though the ID was not found within
* Fixed an instance of undefined behavior in
EbmlElement::GetSemantic() due to binding a dereferenced null
pointer to a reference.
* Replaced the outdated address of the Free Software Foundation
with their current one.