out of tree build fixes

[Tomi Ollila]

On Thu, Mar 20 2014, David Bremner <david at tethera.net> wrote:

> Apparently we've neglected the out of tree builds even more than
> usual. I originally thought this is what was causing the test failures
> on buildbot. I'm less sure now, but I think these fixes don't hurt
> anything, and they do unbreak out of tree builds for me.
>
> There is certainly still work to be done with our out of tree builds.
> For those of you just joining the party, that doesn't mean we want to
> switch to your favourite build system. Or even to Autotools.
>
> An earlier draft of this series (discussed on IRC) defined a builddir
> variable, but eventually I realized the current directory of make is
> always builddir. So at least for now that doesn't seem to be needed.

LGTM. Too bad we cannot expand $(dir) in recipes (or I don't know how),
and using other variables don't bring any benefit (naming would contain
the 'doc' part and we even cannot check whether the variable is defined
or not...).

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