libreoffice: Drop dependency on boost
libreoffice: Drop dependency on boost

Currently the boost system library is unused so we ought to drop it
from DEPENDS for now.

Signed-off-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>

schnitzeltony/meta-office,schnitzeltony/meta-libreoffice