From https://docs.docker.com/engine/reference/run/:
```
When the operator executes docker run --privileged, Docker will enable
access to all devices on the host as well as set some configuration in
AppArmor or SELinux to allow the container nearly all the same access to
the host as processes running outside containers on the host.
```
Regards https://github.com/profanity-im/profanity/issues/1294
* Add .builds/openbsd.yml for builds.sr.ht
* Update travis-build.sh -> ci-build.sh with OpenBSD case
* Fix libdl check in configure.ac (OpenBSD has libdl built-in)
* Fix some minor issues found when compiling on OpenBSD with GCC (e.g.
uninitialized variables)
+ Arch and Debian are run in Docker containers, as openSUSE Tumbleweed.
+ OSX/macOS doesn't use any containers.
* Homebrew is used to fetch all the dependencies.
* The dependencies are declared in the Brewfile.travis file.
+ The travis-build.sh script has been modified to check for the current
OS and the different configure flags has been moved into an array
that'll be looped through instead.
The xscreensaver (for libXScrnSaver) flags has been removed for macOS
as it only makes sense for systems running X11, which macOS doesn't
(usually) do.
+ Some minor shellcheck fixes, too.
Fixes: #1100
Travis supports only quite old Ubuntu releases.
They don't ship with libsignal-protocol-c and not with a recent enough
libgrcypt.
We could build libsignal-protocol-c manually but for libgcrypt it's more
annoying.
Let us switch to Docker and use openSUSE Tumbleweed, which is rolling
release) and thus have up to date libs.
