Build blame cache as own java_library

This is a first step towards properly packaging of blame cache in Gerrit
server which is needed for [1]. [1] currently (PS-44) depends on the
whole gitiles-servlet and this leads to a:

  java.lang.NoClassDefFoundError: com/google/template/soy/SoyFileSet

caused by packaging the gitiles-servlet in the Gerrit core but without
all of its dependencies.

[1] https://gerrit-review.googlesource.com/72798

Change-Id: I9326b30962c21082b3d152eb6397ddcf767d1ce3

gitiles-dev/BUCK

diff --git a/gitiles-dev/BUCK b/gitiles-dev/BUCK
index fe841a8..76775ed 100644
--- a/gitiles-dev/BUCK
+++ b/gitiles-dev/BUCK
@@ -2,6 +2,7 @@
   name = 'lib',
   srcs = glob(['src/main/java/**/*.java']),
   deps = [
+    '//blame-cache:lib',
     '//gitiles-servlet:servlet',
     '//lib:guava',
     '//lib:servlet-api_3_0',