third_party: unbundle jsoncpp dep

The jsoncpp headers are included with a different path so we have to
symlnk them so the are in the dir structure that is expected.

Signed-off-by: Jason Zaman <jason@perfinion.com>

tensorflow/workspace.bzl

@@ -516,6 +516,7 @@ def tf_workspace(path_prefix="", tf_repo_name=""):
       sha256 = "c49deac9e0933bcb7044f08516861a2d560988540b23de2ac1ad443b219afdb6",
       strip_prefix = "jsoncpp-1.8.4",
       build_file = clean_dep("//third_party:jsoncpp.BUILD"),
+      system_build_file = clean_dep("//third_party/systemlibs:jsoncpp.BUILD"),
   )
 
   tf_http_archive(

third_party/systemlibs/jsoncpp.BUILD

@@ -0,0 +1,37 @@
+licenses(["unencumbered"])  # Public Domain or MIT
+
+filegroup(
+    name = "LICENSE",
+    visibility = ["//visibility:public"],
+)
+
+HEADERS = [
+    "include/json/autolink.h",
+    "include/json/config.h",
+    "include/json/features.h",
+    "include/json/forwards.h",
+    "include/json/json.h",
+    "include/json/reader.h",
+    "include/json/value.h",
+    "include/json/version.h",
+    "include/json/writer.h",
+]
+
+genrule(
+    name = "link_headers",
+    outs = HEADERS,
+    cmd = """
+      for i in $(OUTS); do
+        i=$${i##*/}
+        ln -vsf /usr/include/jsoncpp/json/$$i $(@D)/include/json/$$i
+      done
+    """,
+)
+
+cc_library(
+    name = "jsoncpp",
+    hdrs = HEADERS,
+    includes = ["."],
+    linkopts = ["-ljsoncpp"],
+    visibility = ["//visibility:public"],
+)

third_party/systemlibs/syslibs_configure.bzl

@@ -19,6 +19,7 @@ VALID_LIBS=[
     "grpc",
     "jemalloc",
     "jpeg",
+    "jsoncpp_git",
     "lmdb",
     "nasm",
     "org_sqlite",