Start building sysrepo-ietf-alarms

The project also requires date library[1] but it was not running
correctly on our ARM. I had to patch the library with the workaround
from [2], hence the buildroot update.

[1] https://github.com/HowardHinnant/date
[2] https://github.com/HowardHinnant/date/issues/252

Change-Id: Ie82b8c9ea50b0198b024256ff81d67ba7344c190
diff --git a/.zuul.yaml b/.zuul.yaml
index da25c73..c33b12b 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -18,6 +18,7 @@
       - CzechLight/libyang-cpp
       - CzechLight/sysrepo-cpp
       - CzechLight/libnetconf2-cpp
+      - CzechLight/sysrepo-ietf-alarms
       - github/CESNET/libyang
       - github/sysrepo/sysrepo
       - github/CESNET/libnetconf2