Make Python build faster, using the leverage of `ccache`

Current versions

pyenv-ccache requires the following formula to be installed:
ccache 3.4.1 Object-file caching compiler wrapper

Recent formula history

Mike McQuaid pyenv-ccache: bottle unneeded.
Andrea Kao pyenv-ccache: fix audit warning
Nikolaus Wittenstein Add descriptions to all remaining homebrew packages
Xu Cheng pyenv-ccache: add ccache deps and test
Xu Cheng pyenv-ccache 0.0.2

Formula code at GitHub