Guetzli: enable UBSAN, add Zoltan to auto_ccs. (#490)
Guetzli: enable UBSAN, add Zoltan to auto_ccs. (#490)

All spotted implementation-specific/undefined behaviour has been fixed:
google/guetzli#142, google/guetzli#144, google/guetzli#154.
google/oss-fuzz,robertswiecki/oss-fuzz,robertswiecki/oss-fuzz,google/oss-fuzz,googlefonts/oss-fuzz,vitalybuka/oss-fuzz,kcc/oss-fuzz,google/oss-fuzz,ssbr/oss-fuzz,skia-dev/oss-fuzz,skia-dev/oss-fuzz,robertswiecki/oss-fuzz,skia-dev/oss-fuzz,oliverchang/oss-fuzz,googlefonts/oss-fuzz,FeliciaLim/oss-fuzz,google/oss-fuzz,google/oss-fuzz,oliverchang/oss-fuzz,google/oss-fuzz,robertswiecki/oss-fuzz,FeliciaLim/oss-fuzz,FeliciaLim/oss-fuzz,googlefonts/oss-fuzz,ssbr/oss-fuzz,google/oss-fuzz,googlefonts/oss-fuzz,vitalybuka/oss-fuzz,skia-dev/oss-fuzz,kcc/oss-fuzz,googlefonts/oss-fuzz,skia-dev/oss-fuzz,ssbr/oss-fuzz,kcc/oss-fuzz,robertswiecki/oss-fuzz,FeliciaLim/oss-fuzz,skia-dev/oss-fuzz,oliverchang/oss-fuzz,robertswiecki/oss-fuzz,kcc/oss-fuzz,ssbr/oss-fuzz,skia-dev/oss-fuzz,kcc/oss-fuzz,googlefonts/oss-fuzz,robertswiecki/oss-fuzz,google/oss-fuzz,robertswiecki/oss-fuzz,FeliciaLim/oss-fuzz,robertswiecki/oss-fuzz,google/oss-fuzz,vitalybuka/oss-fuzz,google/oss-fuzz,skia-dev/oss-fuzz,vitalybuka/oss-fuzz,vitalybuka/oss-fuzz,robertswiecki/oss-fuzz,ssbr/oss-fuzz,skia-dev/oss-fuzz,googlefonts/oss-fuzz,oliverchang/oss-fuzz,googlefonts/oss-fuzz,skia-dev/oss-fuzz,googlefonts/oss-fuzz,googlefonts/oss-fuzz,oliverchang/oss-fuzz,google/oss-fuzz,robertswiecki/oss-fuzz,skia-dev/oss-fuzz