[issue36235] distutils.sysconfig.customize_compiler() overrides CFLAGS var with OPT var if CFLAGS env var is set

[Chih-Hsuan Yen]

Change by Chih-Hsuan Yen <yan12125 at gmail.com>:


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pull_requests: +12338

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36235>
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