Update Buck

java_library() now accepts provided_deps argument which replaces
use of custom java_library2() from bucklets library.

Change-Id: I3a69287543c3dbbcb5142ea77d5a6e447a073dd8

.buckversion

diff --git a/.buckversion b/.buckversion
index cec726d..2c9f529 100644
--- a/.buckversion
+++ b/.buckversion
@@ -1 +1 @@
-1ba4496a782b40dec33a42e69a74837afee06177
+021695d5e68cde7457c9849fd0a2397f91e6491e

gitiles-servlet/BUCK

diff --git a/gitiles-servlet/BUCK b/gitiles-servlet/BUCK
index e10616c..8ff8035 100644
--- a/gitiles-servlet/BUCK
+++ b/gitiles-servlet/BUCK
@@ -1,4 +1,3 @@
-include_defs('//bucklets/java_library2.bucklet')
 include_defs('//bucklets/java_sources.bucklet')
 include_defs('//bucklets/java_doc.bucklet')
 
@@ -21,12 +20,12 @@
   '//lib/guice:guice',
 ]
 
-java_library2(
+java_library(
   name = 'servlet',
   srcs = SRCS,
   resources = RSRC,
   deps = DEPS_ALL,
-  compile_deps = ['//lib:servlet-api_2_5'],
+  provided_deps = ['//lib:servlet-api_2_5'],
   visibility = ['PUBLIC'],
 )