Auto merge of #3433 - adder32:define-getname-info-extensions, r=JohnT…

…itor

Add the NI_IDN getnameinfo() extension

This PR adds the `NI_IDN` getnameinfo extension.

I've also tried to add the other two extensions (see: https://man7.org/linux/man-pages/man3/getnameinfo.3.html), but the tests would fail (`-Werror`) because those two are deprecated.

src/unix/linux_like/linux/mod.rs

@@ -2103,6 +2103,7 @@ pub const NI_NUMERICSERV: ::c_int = 2;
 pub const NI_NOFQDN: ::c_int = 4;
 pub const NI_NAMEREQD: ::c_int = 8;
 pub const NI_DGRAM: ::c_int = 16;
+pub const NI_IDN: ::c_int = 32;
 
 pub const SYNC_FILE_RANGE_WAIT_BEFORE: ::c_uint = 1;
 pub const SYNC_FILE_RANGE_WRITE: ::c_uint = 2;