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/package/sysrepo-ietf-alarms/Config.in b/package/sysrepo-ietf-alarms/Config.in
new file mode 100644
index 0000000..0d87925
--- /dev/null
+++ b/package/sysrepo-ietf-alarms/Config.in
@@ -0,0 +1,12 @@
+config BR2_PACKAGE_SYSREPO_IETF_ALARMS
+	bool "velia"
+	select BR2_PACKAGE_DOCOPT_CPP
+	select BR2_PACKAGE_SPDLOG
+	select BR2_PACKAGE_SYSREPO
+	select BR2_PACKAGE_SYSREPO_CPP
+	select BR2_PACKAGE_CZECHLIGHT_CFG_FS
+	select BR2_PACKAGE_DATE
+	help
+	  Implementing the `ietf-alarms` YANG module for sysrepo.
+
+	  https://gerrit.cesnet.cz/q/project:CzechLight/sysrepo-ietf-alarms