systemlibs: Unbundle double_conversion library

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

tensorflow/workspace.bzl

@@ -738,14 +738,16 @@ def tf_workspace(path_prefix = "", tf_repo_name = ""):
         build_file = clean_dep("//third_party:arm_neon_2_x86_sse.BUILD"),
     )
 
-    native.new_http_archive(
+    tf_http_archive(
         name = "double_conversion",
         urls = [
+            "https://mirror.bazel.build/github.com/google/double-conversion/archive/3992066a95b823efc8ccc1baf82a1cfc73f6e9b8.zip",
             "https://github.com/google/double-conversion/archive/3992066a95b823efc8ccc1baf82a1cfc73f6e9b8.zip",
         ],
         sha256 = "2f7fbffac0d98d201ad0586f686034371a6d152ca67508ab611adc2386ad30de",
         strip_prefix = "double-conversion-3992066a95b823efc8ccc1baf82a1cfc73f6e9b8",
         build_file = clean_dep("//third_party:double_conversion.BUILD"),
+        system_build_file = clean_dep("//third_party/systemlibs:double_conversion.BUILD"),
     )
 
     tf_http_archive(

third_party/systemlibs/double_conversion.BUILD

@@ -0,0 +1,12 @@
+licenses(["notice"])
+
+filegroup(
+    name = "LICENSE",
+    visibility = ["//visibility:public"],
+)
+
+cc_library(
+    name = "double-conversion",
+    linkopts = ["-ldouble-conversion"],
+    visibility = ["//visibility:public"],
+)

third_party/systemlibs/syslibs_configure.bzl

@@ -14,6 +14,7 @@ VALID_LIBS = [
     "com_googlesource_code_re2",
     "curl",
     "cython",
+    "double_conversion",
     "flatbuffers",
     "gif_archive",
     "grpc",