Weston 8 doesn't create "headless" output.

Hi,

We at Chromium use Weston to run ui test suites with native Wayland backend. Recently, we've started to switch to Weston 8.0.0, but noticed that headless Weston doesn't create an output. The reason turned out to be with uninitialized bool. You have already had a patch in the master branch that fixed the issue [1]. Thus, question - would it be possible to merge that to 8.0.0 tag? Our bots compile weston from source and I would prefer if the tag is properly updated instead of us patching that locally. Thanks!

[1] 9096dee4