[Bazel] Do not set -pthread etc. on Windows

Doing the same thing as Tensorflow, Protobuf and GoogleTest.

-
https://github.com/tensorflow/tensorflow/blob/master/tensorflow/BUILD#L108
- https://github.com/google/protobuf/blob/master/BUILD#L32
- https://github.com/google/googletest/blob/master/BUILD.bazel#L39

Change-Id: Ic6efc70a3021c00bb8a2200766a98266de747f26
Reviewed-on: https://code-review.googlesource.com/21970
Reviewed-by: Paul Wankadia <junyer@google.com>
1 file changed