[infra] enabling leak detector by default
[infra] enabling leak detector by default

Fixes #9
Issues like #224 should fail the build now.

skia-dev/oss-fuzz,oliverchang/oss-fuzz,googlefonts/oss-fuzz,googlefonts/oss-fuzz,robertswiecki/oss-fuzz,google/oss-fuzz,ssbr/oss-fuzz,skia-dev/oss-fuzz,FeliciaLim/oss-fuzz,robertswiecki/oss-fuzz,FeliciaLim/oss-fuzz,robertswiecki/oss-fuzz,googlefonts/oss-fuzz,vitalybuka/oss-fuzz,ssbr/oss-fuzz,google/oss-fuzz,google/oss-fuzz,kcc/oss-fuzz,skia-dev/oss-fuzz,robertswiecki/oss-fuzz,robertswiecki/oss-fuzz,skia-dev/oss-fuzz,ssbr/oss-fuzz,google/oss-fuzz,oliverchang/oss-fuzz,google/oss-fuzz,google/oss-fuzz,googlefonts/oss-fuzz,robertswiecki/oss-fuzz,kcc/oss-fuzz,google/oss-fuzz,skia-dev/oss-fuzz,google/oss-fuzz,robertswiecki/oss-fuzz,FeliciaLim/oss-fuzz,kcc/oss-fuzz,ssbr/oss-fuzz,googlefonts/oss-fuzz,googlefonts/oss-fuzz,vitalybuka/oss-fuzz,google/oss-fuzz,vitalybuka/oss-fuzz,google/oss-fuzz,oliverchang/oss-fuzz,vitalybuka/oss-fuzz,robertswiecki/oss-fuzz,ssbr/oss-fuzz,kcc/oss-fuzz,skia-dev/oss-fuzz,googlefonts/oss-fuzz,kcc/oss-fuzz,skia-dev/oss-fuzz,skia-dev/oss-fuzz,google/oss-fuzz,skia-dev/oss-fuzz,googlefonts/oss-fuzz,robertswiecki/oss-fuzz,vitalybuka/oss-fuzz,FeliciaLim/oss-fuzz,googlefonts/oss-fuzz,oliverchang/oss-fuzz,robertswiecki/oss-fuzz,FeliciaLim/oss-fuzz,oliverchang/oss-fuzz,skia-dev/oss-fuzz,googlefonts/oss-fuzz,robertswiecki/oss-fuzz,skia-dev/oss-fuzz