bpo-34689: Prevent sysconfig._parse_makefile from expanding $${variables} #9362
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As described in bpo-34689, sysconfig._parse_makefile recognizes
$${variable}as a variable to expand in the second half of the_parse_makefilefunction.This pull-request aims to fix that by splitting strings on
$$before looking for variables in them and restoring the$$in values that require more processing.There is no change to the documentation as this is a bug-fix.
https://bugs.python.org/issue34689