app: Extend CI to build on OpenBSD now that golang.org/x/sys is updated.

I was able to get the Pipe2 syscall added for OpenBSD:
https://go.googlesource.com/sys/+/9fbb57f87de9ccfe3a99d4e3270ce8a926ebba4f

This also updates the dependencies to include the latest sys and gio.

I submitted a patch to the builder environment to include the xshare sets on
OpenBSD. Once that is in it will mean the "install_deps" block can be removed.

  https://lists.sr.ht/~sircmpwn/sr.ht-dev/patches/9640

Here is a link to a successful build: https://builds.sr.ht/~qbit/job/143004

Signed-off-by: Aaron Bieber <aaron@bolddaemon.com>

.builds/openbsd.yml

@@ -0,0 +1,23 @@
+image: openbsd/latest
+packages:
+ - libxkbcommon
+ - go
+sources:
+ - https://git.sr.ht/~eliasnaur/gio
+environment:
+    PATH: /home/build/bin:/bin:/usr/local/bin:/usr/bin
+tasks:
+ - install_gotip: |
+     go get golang.org/dl/gotip
+     /home/build/go/bin/gotip download
+     mkdir /home/build/bin
+     ln -s /home/build/go/bin/gotip /home/build/bin/go
+ - test_gio: |
+     cd gio
+     go test ./...
+ - test_example: |
+     cd gio/example
+     go test ./...
+ - test_cmd: |
+     cd gio/cmd
+     go test ./...