Message 121207 - Python tracker

As suggested in issue 9561, I'm creating a new bug for the encoding problem in build_scripts: If a script file can't be decoded with the (locale dependent) standard encoding, then "build_scripts" fails with UnicodeDecodeError. Reproducable e.g. with LANG=C and a script file containing non ASCII chars near the beginning (so that they're read on a single readline()).

Attaching a patch that uses "surrogateescape", as proposed for issue 6011.