Sharp resizing changes 0.29 vs 0.30

Fixes with sharp 0.30.7 lovell/sharp#3262

cd ./sharp-0.30
yarn

cd ./sharp-0.29
yarn

node sharp-0.29/index.js # Outputs a PNG

node sharp-0.30/index.js # Error: webp: bad image dimensions

Problem

Scaling a webp image past 16383 x 16383 now fails

pipeline.resize(32768, 32768).extract({ top: 16384, left: 16384, width: 1024, height: 1024 })