Fix media_cas_proxy_sdk build issue.

Add example binary for testing building the SDK after 'git clone' from our repo.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=227583629

util/BUILD

@@ -15,22 +15,6 @@ filegroup(
     name = "binary_release_files",
     srcs = [
         "error_space.h",
-        "status.h",
-    ],
-)
-
-cc_library(
-    name = "status",
-    srcs = [
-        "status.cc",
-    ],
-    hdrs = [
-        "status.h",
-    ],
-    deps = [
-        ":error_space",
-        "//base",
-        "@abseil_repo//absl/strings",
     ],
 )
 
@@ -43,17 +27,8 @@ cc_library(
     name = "proto_status",
     hdrs = ["proto_status.h"],
     deps = [
-        ":status",
         "//external:protobuf",
-    ],
-)
-
-cc_test(
-    name = "status_test",
-    srcs = ["status_test.cc"],
-    deps = [
-        ":status",
-        "//testing:gunit_main",
+        "//util:error_space",
     ],
 )