Update build.sh

Added torchaudio from source.

Author: brianjo

.jenkins/build.sh

@@ -29,11 +29,11 @@ pip install -e git+git://github.com/pytorch/pytorch_sphinx_theme.git#egg=pytorch
 # this is a workaround to the issue.
 pip install sphinx-gallery==0.3.1 tqdm matplotlib ipython pillow==4.1.1
 
-# Install torchaudio from source
-# git clone https://github.com/pytorch/audio --quiet
-# pushd audio
-# python setup.py install
-# popd
+Install torchaudio from source
+git clone https://github.com/pytorch/audio --quiet
+pushd audio
+python setup.py install
+popd
 
 aws configure set default.s3.multipart_threshold 5120MB
 
@@ -185,4 +185,4 @@ else
 fi
 
 rm -rf vision
-# rm -rf audio
+rm -rf audio