sys/posix/include/arpa: use __restrict instead of restrict

[laurin]

Contribution description

Replace restrict with __restrict in sys/posix/include/arpa because the restrict keyword is not available in C++.
Resolves this error message:

<RIOTBASE>/sys/posix/include/arpa/inet.h:62:52: error: expected ‘,’ or ‘...’ before ‘src’
   62 | const char *inet_ntop(int af, const void *restrict src, char *restrict dst,
      |                                                    ^~~

Testing procedure

Green Murdock

[benpicco]

Thank you for the patch!
CI is happy too.
Just one thing: please also prefix the commit message like you did with the pull request, so

sys/posix/include/arpa: use __restrict instead of restrict

or just

sys/posix: use __restrict instead of restrict

[laurin]

Ok, thanks for the heads up!

[maribu]

@laurin: ping. Only the commit message needs to be adapted to get this in ;)

[laurin]

@maribu Oh sorry, it's fixed now in 550f5ea