Add @com_google_absl//absl/strings:cord (tensorflow#1308)

Fix read/STDIN_FILENO

Signed-off-by: Yong Tang <[email protected]>

Author: yongtang

third_party/toolchains/tf/BUILD.tpl

@@ -8,6 +8,7 @@ cc_library(
         "@com_google_absl//absl/container:flat_hash_map",
         "@com_google_absl//absl/container:inlined_vector",
         "@com_google_absl//absl/strings",
+        "@com_google_absl//absl/strings:cord",
         "@com_google_absl//absl/types:optional",
         "@com_google_absl//absl/types:span",
     ],