[issue36106] resolve sinpi() name clash with libm

[Dmitrii Pasechnik]

Dmitrii Pasechnik <dimpase at gmail.com> added the comment:

This has a potential header conflict. For the same reason functions like
lgamma, etc. are prefixed with `m_` in Modules/mathmodule.c

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36106>
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