message: Adding manual tags for platform-specific build targets under tf/core/platform/BUILD.
  See the rationale here: #32283#issuecomment-529003011
diff: @@ -16,13 +16,13 @@ TF_PLATFORM_LIBRARIES = {
  "//tensorflow/core/platform",
  ],
  "visibility": ["//visibility:private"],
  - "tags": ["no_oss"],
  + "tags": ["no_oss", "manual"],
  },
  "cord": {
  "name": "cord_impl",
  "hdrs": ["//tensorflow/core/platform:default/cord.h"],
  "visibility": ["//visibility:private"],
  - "tags": ["no_oss"],
  + "tags": ["no_oss", "manual"],
  },
  "env_time": {
  "name": "env_time_impl",
  @@ -36,7 +36,7 @@ TF_PLATFORM_LIBRARIES = {
  "//tensorflow/core/platform:types",
  ],
  "visibility": ["//visibility:private"],
  - "tags": ["no_oss"],
  + "tags": ["no_oss", "manual"],
  },
  }
  @@ -53,7 +53,7 @@ TF_WINDOWS_PLATFORM_LIBRARIES = {
  "//tensorflow/core/platform:types",
  ],
  "visibility": ["//visibility:private"],
  - "tags": ["no_oss"],
  + "tags": ["no_oss", "manual"],
  },
  }
  