rocksdb: Skip CircleCI for Linuxbrew (#3109)
rocksdb: Skip CircleCI for Linuxbrew (#3109)

The 4 GB memory limit of CircleCI is insufficient.
maxim-belkin/homebrew-core,maxim-belkin/homebrew-core,rwhogg/homebrew-core,LinuxbrewTestBot/homebrew-core,Linuxbrew/homebrew-core,rwhogg/homebrew-core,Linuxbrew/homebrew-core,LinuxbrewTestBot/homebrew-core