New issue by schmidh on void-packages repository

https://github.com/void-linux/void-packages/issues/15817

Description:
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### System

* xuname:  
  *Void 5.2.21_1 x86_64 AuthenticAMD notuptodate rrFFF*
* package:  
  *lksctp-tools 1.0.18*

### Expected behavior
Should install **sctp.h** in /usr/include/netinet
### Actual behavior
Installs **sctp.h.in** in /usr/include/netinet
### Steps to reproduce the behavior
sudo xbps-install lksctp-tools