This folder was created as follows:
cd third_party
curl -L -O https://github.com/zeux/meshoptimizer/archive/0a816f5.zip
unzip 0a816f5.zip
mv meshoptimizer-* meshoptimizer
cd meshoptimizer
rm -rf demo tools
mv LICENSE.md LICENSE
Comment-out the following:
# option(BUILD_DEMO "Build demo" OFF)
To update the library, you can do this:
curl -L -O https://github.com/zeux/meshoptimizer/archive/master.zip
unzip master.zip
cp -r meshoptimizer-master/src/ meshoptimizer/src/