Add diffutils to //third_party/java in bazel-common and make it a run…

…time dependency of truth.

Also change truth8 target to just export the truth target; I'm unclear on why it's a separate target for the same thing though.

RELNOTES=n/a
PiperOrigin-RevId: 336145537

third_party/java/diffutils/BUILD

@@ -0,0 +1,26 @@
+# Copyright (C) 2018 The Google Bazel Common Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# BUILD rules for https://github.com/google/truth
+
+load("@rules_java//java:defs.bzl", "java_library")
+
+package(default_visibility = ["//visibility:public"])
+
+java_library(
+    name = "diffutils",
+    exports = [
+        "@com_googlecode_java_diff_utils_diffutils//jar",
+    ],
+)

third_party/java/truth/BUILD

@@ -25,13 +25,15 @@ java_library(
         "@com_google_truth_extensions_truth_java8_extension//jar",
         "@com_google_truth_truth//jar",
     ],
+    runtime_deps = [
+        "//third_party/java/diffutils",
+    ],
 )
 
 java_library(
     name = "truth8",
     testonly = 1,
     exports = [
-        "@com_google_truth_extensions_truth_java8_extension//jar",
-        "@com_google_truth_truth//jar",
+        ":truth",
     ],
 )