remove -warn-long-function-bodies flag from Release configuration
remove -warn-long-function-bodies flag from Release configuration

they're really just a development tool and having it enabled for
release builds risks it tripping when we're trying to cut a release
like what happened with 0.18.0 on Homebrew's CI.

https://github.com/Homebrew/homebrew-core/pull/12161

firebase/SwiftLint,victorpimentel/SwiftLint,lyft/SwiftLint,victorpimentel/SwiftLint,lyft/SwiftLint,realm/SwiftLint,victorpimentel/SwiftLint,realm/SwiftLint,firebase/SwiftLint,victorpimentel/SwiftLint,realm/SwiftLint,realm/SwiftLint,firebase/SwiftLint,lyft/SwiftLint,firebase/SwiftLint,lyft/SwiftLint