Coding style of create-version-itexi.py

[John Mandereau]

Hi Graham,

scripts/build/create-version-itexi.py has a couple of coding style
nitpicks that should be fixed:

- every tab should be replaced with 4-spaces;
- duplicate definition of depth looks like a maintenance nightmare
similar to the issue Joe just reported on -devel;
- "line[0:x] ==" should be replaced with more easy-to-write
"line.startswith";
- uncleaned commented code that according to the comment doesn't work
with Python 2.4.5.

Best,
John

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