strncat
=======

POSIX specification:
 https://pubs.opengroup.org/onlinepubs/9699919799/functions/strncat.html

Gnulib module: strncat

Portability problems fixed by Gnulib:

  * This function dereferences too much memory on some platforms: Solaris 10 on SPARC, Solaris 11.0 on x86.

  * This function cannot be called from plain inline or extern inline functions on some platforms: OS X 10.8.

Portability problems not fixed by Gnulib: