Bugged QGIS algs.txt generation on Windows

Description

Buggy only on Windows (what a surprise). The algs.txt containing all algorithms that QGis can use is generated in a random way since we are using powershell with gitlab-runner.

Steps to reproduce

Run the Windows CI script and check the result in package in share/otb/description/algs.txt . Depending of the moonphase and the taste of your coffee the content of the file can be different from the one on Linux.

Idea of correction

The hypothesis is the following: the algs.txt is generated by a multithreaded processing. This multiprocessing script seams to be bugged since powershell.

Definition of Done

algs.txt identical to the one on Linux