Naming convention for gbuild methods:
- "add" is used for stuff that is logically a part of the target
(i.e. not registered at the Module, but defined in the target's makefile)
- "use" is used for stuff that is logically a different target
(i.e. it is registered at the Module, has it's own makefile, may be
in a different module than the target)
Berkeley DB is used for help index and extension database. (Possibly
only for a backward-compatible format of the latter, I am not sure.)
Neither use makes much sense on Android and iOS.
The existing help is for LO on desktop OSes anyway, help for LO-based
apps on iOS and Android will naturally be quite different.
On iOS there will definitely be no "extensions", and probably we don't
want to bother with such on Android either.
