label_image doesn't build on Linux and macOS platforms
```
bazel build --config opt //tensorflow/lite/examples/label_image:label_image
```
shows something like
```
ERROR: /home/freedom/work/tensorflow/tensorflow/lite/examples/label_image/BUILD:15:1: undeclared inclusion(s) in rule '//tensorflow/lite/examples/label_image:label_image':
this rule is missing dependency declarations for the following files included by 'tensorflow/lite/examples/label_image/label_image.cc':
'external/com_google_absl/absl/strings/string_view.h'
'external/com_google_absl/absl/base/internal/throw_delegate.h'
```
Add `"@com_google_absl//absl/strings"` to deps
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