Try not to kill build hosts
Try not to kill build hosts

Remove the -j argument from ndk-build in gradle build file, it meant "allow
infitie jobs". Build hosts unfortunately have finite resources.

litl/android-leveldb,michalliu/android-leveldb,michalliu/android-leveldb,litl/android-leveldb,litl/android-leveldb,michalliu/android-leveldb,michalliu/android-leveldb,michalliu/android-leveldb,litl/android-leveldb,michalliu/android-leveldb,litl/android-leveldb