Improve buildbot script

Improve buildbot script

PR created under the employment of EvidenceBKidscode

* Variables to set git repositories urls (allows to build from another repo)
* Variables to set git branch to build from (allows to build from non-master branch)
* Variables to change built name
* Make -j uses the proper number of processors (autodetect)
* Changed toolchain from win32 to adpat it to non-debian distros