[issue36106] resolve sinpi() name clash with libm

[Dmitrii Pasechnik]

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

e.g. if I rename `m_lgamma` to `lgamma` I get
```
mathmodule.c:389:1: error: static declaration of ‘lgamma’ follows non-static declaration
 lgamma(double x)
```

----------

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