gai_strerror
============

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

Gnulib module: getaddrinfo

Portability problems fixed by Gnulib:

  * This function is missing on some platforms: HP-UX 11.11, IRIX 6.5, Cygwin 1.5.x.

  * This function is only available in <ws2tcpip.h> on some platforms: mingw, MSVC 14.

  * This function's return type is char * instead of const char * on some platforms: AIX 7.1, HP-UX 11, Solaris 9, mingw, MSVC 14.

Portability problems not fixed by Gnulib: