[SeaBIOS] [Patch] Force usage of Python 2 on systems with Python 3 as default

[Johannes Krampf]

Hello SeaBIOS developers,

I'm using SeaBIOS together with Coreboot and it works very well. Thank 
you for your great work!

The compilation of coreboot is done on a system where /usr/bin/python 
refers to python3. This makes scripts in the Python2 dialect fail with a 
syntax error.

Since afaik Ubuntu will use Python 3 as default in the next release a 
bigger number of people will be affected by this when compiling coreboot.

According to PEP-394 (http://www.python.org/dev/peps/pep-0394/) systems 
are supposed to have a "python2" command which refers to Python 2. This 
is the case on the systems I've tested. (Note: I have not tested many 
enterprise distributions.)

I *think* it should be safe to make the usage of python2 explicit and 
I've attached a patch to do so. The patch should be trivial, but please 
tell me if you require any adjustments. I will be happy to do them.

Should you have reservations over this patch due to some older systems 
possibly not having "python2", I might also try to make the scripts 
compatible with both Python 2 and Python 3.

Regards,

Johannes

P.S. Please be so kind as to CC me in any responses as I'm not 
subscribed to the list.

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