LibreOffice bibisect repo auto build
@author: Kevin Suo <suokunlong@126.com>

    1. Clone libreoffice source codes.
    2. Define the variables within this python code below.
    3. Change "start_commit" and "to_commit" to the range you want to build.
    4. By default, I use "step = 3" below, which means we build one bibisect
       commit for every 3 source commits. You can change this to meet your own needs.
    5. Run.

For details of how bibisecting works, see https://wiki.documentfoundation.org/QA/Bibisect
Bibisect 的工作原理,请见:https://wiki.documentfoundation.org/QA/Bibisect/zh-hans