Fix building on raspberry pi

[DanBmh]

Description

Fix building package on raspberry pi

Type of change

• Bug fix

Checklist:

• I've properly formatted my code according to the guidelines
  • By running Black + Flake8
  • By running pre-commit hooks
• This PR addresses an already submitted issue for TensorFlow Addons
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• This PR contains modifications to C++ custom-ops

How Has This Been Tested?

Build of package in raspbian buster container did work after applying the suggested changes

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[DanBmh]

@googlebot I signed it!

[seanpmorgan]

We're unable to test this without a ARM CI, but looks correct and shouldn't have any negative effects for the other builds we support.

Thanks for the PR!

[StuartIanNaylor]

Any chance anyone could do aarch64 build for the pi? I tried but failed even after doing a symlink to _pywrap_tensorflow_internal

[Qengineering]

@StuartIanNaylor could you be so kind to have a look at pull request #2420, A fix for the Raspberry Pi 64-bit OS and Jetson Nanon?

[StuartIanNaylor]

sudo nano configure.py Change 2 lines to the following:-

def is_raspi_arm():
    return (os.uname()[4] == "armv7l") or (os.uname()[4] == "aarch64")  
    
    if is_macos() or is_linux():
#        write("build --copt=-mavx") <-not known in gcc aarch64 
        write("build --cxxopt=-std=c++14")
        write("build --host_cxxopt=-std=c++14")
        
 sudo ln -s /home/pi/google-kws/venv/lib/python3.7/site-packages/tensorflow/python/_pywrap_tensorflow_internal.so /usr/lib/lib_pywrap_tensorflow_internal.so

Works for Aarch64 just do the normal install after