Fix broken vita std compilation by adding SOMAXCONN

[pheki]

std is broken on PS Vita since rust-lang/rust#119026

• vita's SOMAXCONN discovered empirically
• esp-idf's SOMAXCONN from https://github.com/espressif/esp-idf/blob/b3f7e2c8a4d354df8ef8558ea7caddc07283a57b/components/newlib/platform_include/net/if.h#L20 (removed as it was probably incorrect, see comment)

@ivmarkov can you confirm the esp change?

[rustbot]

r? @JohnTitor

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[ivmarkov]

std is broken on PS Vita since rust-lang/rust#119026

• vita's SOMAXCONN discovered empirically
• esp-idf's SOMAXCONN from https://github.com/espressif/esp-idf/blob/b3f7e2c8a4d354df8ef8558ea7caddc07283a57b/components/newlib/platform_include/net/if.h#L20

@ivmarkov can you confirm the esp change?

I don't think the ESP IDF's SOMAXCONN value of 128 is correct either, given that LwIP supports at most 10 to 16 sockets.
BUT: Not so important for ESP IDF really because
(a) I already PR-ed a fix to Rust STD for ESP IDF-specifically, which removes the SOMAXCONN usage; the PR was merged last week
(b) The breakage of STD is w.r.t. Unix domain sockets, which are not a thing on ESP IDF anyway and if the usert tries to use these, they would return a runtime error (we just wanted STD to compile)

[pheki]

I don't think the ESP IDF's SOMAXCONN value of 128 is correct either, given that LwIP supports at most 10 to 16 sockets.

Interesting... I removed ESP's definition then, thanks!

[JohnTitor]

Could you rebase onto main to trigger full CI?

[pheki]

Could you rebase onto main to trigger full CI?

Forgot to comment, but done!

[JohnTitor]

Thanks!