Remove buck build

Buck build was replaced with Bazel build.

Change-Id: I34c2f1a140414aca07dbf0ab30f91a09f5ad7d72
diff --git a/BUCK b/BUCK
deleted file mode 100644
index 2ea01c2..0000000
--- a/BUCK
+++ /dev/null
@@ -1,13 +0,0 @@
-MODULE = 'com.googlesource.gerrit.plugins.menuextender.MenuExtenderPlugin'
-
-gerrit_plugin(
-  name = 'menuextender',
-  srcs = glob(['src/main/java/**/*.java']),
-  resources = glob(['src/main/**/*']),
-  gwt_module = MODULE,
-  manifest_entries = [
-    'Gerrit-PluginName: menuextender',
-    'Gerrit-Module: com.googlesource.gerrit.plugins.menuextender.Module',
-    'Gerrit-HttpModule: com.googlesource.gerrit.plugins.menuextender.HttpModule',
-  ]
-)