As discussed in issue #17638, wherein kahip fails to build when
scons is dependent on python@3.
This converts the print statements in various SConstruct files
into python3 friendly print functions.
I found most of the affected SConstruct files in both @2.00 and
the later versions I found on web, but some files were only in @2.00.
I split the patches into two files for that reason, but have not
tried the later versions.
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