Homebrew installation flag `--with-*` is no longer needed

According to the update log of homebrew 2.0(https://brew.sh/2019/02/02/homebrew-2.0.0/), the flag was removed from official formula.

Homebrew does not have any formulae with options in Homebrew/homebrew-core. Options will still be supported and encouraged by third-party taps. This change allows us to better focus on delivering binary packages rather than options. Formulae with options had to be built from source, could not be tested on our CI system and provided a disproportionate support burden on our volunteer maintainers.

I think it works without the flags.