Debian contains /debian/patches/fixes/widevine-revision.patch, similar patch exists in Arch also, but not in Ubuntu.
Also fix_building_widevinecdm_with_chromium.patch is probably not needed anymore. There isn't similar patch in Arch nor Debian.
Maybe replacing fix_building_widevinecdm_with_chromium.patch with widevine-revision.patch will help
Debian contains /debian/ patches/ fixes/widevine- revision. patch, similar patch exists in Arch also, but not in Ubuntu. widevinecdm_ with_chromium. patch is probably not needed anymore. There isn't similar patch in Arch nor Debian. widevinecdm_ with_chromium. patch with widevine- revision. patch will help
Also fix_building_
Maybe replacing fix_building_