Include gerrit.war in api_{install,deploy}

This patch adds gerrit.war into api_{install,deploy} buck build step.
This allows third party maven based builds depend on gerrit.war
artifact.

Change-Id: I22c8d3339a1647913967e423e45462c2c5c255de
Signed-off-by: Dariusz Luksza <dariusz@luksza.org>
diff --git a/tools/build.defs b/tools/build.defs
index b62c850..21191cf 100644
--- a/tools/build.defs
+++ b/tools/build.defs
@@ -67,7 +67,7 @@
     visibility = visibility,
   )
 
-def gerrit_war(name, ui = 'ui_optdbg', context = []):
+def gerrit_war(name, ui = 'ui_optdbg', context = [], visibility = []):
   war(
     name = name,
     libs = LIBS + ['//gerrit-war:version'],
@@ -77,4 +77,5 @@
       '//gerrit-war:webapp_assets.zip',
       '//gerrit-gwtui:' + ui + '.zip',
     ] + context,
+    visibility = visibility,
   )