Fix build issue on mac with python-2.7.10 and clang 9.1.0

In PR 19993 the build issues on macOS with python2.7.10 and clang-9.1.0
were fixed. However, later on it looks like the order of `<locale>`
and `<Python.h>` has been changed in
https://github.com/tensorflow/tensorflow/commit/1e7b0e4ad6d0f57f3241fe0b80a65f2c2a7f11b0


possibly caused by `clang-format -i --style=`.

This caused the build break of macOS with python-2.7.10 and clang 9.1.0
again.

This fix updates the impacted files, and, adds an empty line
in between so that future `clang-format -i --style` will
not cuase build breaks.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>