[Buildroot] [PATCHv3] gdb: prevent building the documentation

[Brendan Heading]

> Maybe we could do a similar thing for the binutils package (which is
> the only other user of the host-texinfo package), and then remove the
> host-texinfo package altogether. That's obviously a completely separate
> set of changes.

Why not keep host-texinfo around, even if it is not used by any
package which is included with buildroot ?

It would be useful to people maintaining their own packages within
buildroot, now or in the future, where it's easier for them to add the
dependency rather than figure out how/where to patch the package to
prevent it from building documentation.

Brendan