[issue33990] CPPFLAGS during ./configure are not passed-through in sysconfig.customize_compiler

[Chih-Hsuan Yen]

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


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nosy:  -yan12125

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33990>
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