* adds third_party/libwebp and cmake option to enable building it. * disable simd and default disable pthreads for webgl builds. * ensure non-empty config var value * Added notes on libwebp change to NEW_RELEASE_NOTES.md * Update NEW_RELEASE_NOTES.md
This folder was last updated as follows: edit update_libwebp.sh to assign desired value to shell variable 'tag' ./update_libwebp.sh