update libjpeg-turbo and libwebp to the current versions
libjpeg-turbo released version 2.0 which includes a number of fixes SumatraPDF still uses 1.3.1
libwebp has finally released the milestone 1.0 version SumatraPDF uses 0.4.2
afaik there has been no api change and upgrades should be simple
lzma has also been updated to 18.05 Sumatra uses 9.22 while it does say it’s beta according to the 7-zip developer the 18.05 branch is a stable release