fuzz: fix Makefile default PYTHON_CONFIG_FLAGS to be modern
This is actually what we already do on oss-fuzz, so it's more correct as tests
go.
Differential Revision: https://phab.mercurial-scm.org/D9790
BasedOnStyle: LLVM
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IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2