docs(docs/icpm_echo): Added requires libraries to the code example so that it doesn't throw undeclared error (IDFGH-14318)

[b0tFilip]

Added libraries so that the code example doesn't throw errors about undeclared struct and function.
It didn't work because of missing declarations:
struct addrinfo
getaddrinfo()

It's just a small detail but it cost me an hour of debuging to find these libs that fix it.

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[david-cermak]

Thanks for your help and contribution!
could you please address the formal issues with

• you commit message as mentioned here?
• make the same changes also the CN docs in docs/zh_CN/api-reference/protocols/icmp_echo.rst?