Auto merge of rust-lang#116518 - vita-rust:vita, r=workingjubilee

Updated libc and doc for Vita target

Doc changes:

- Updated Vita target readme. The recommended approach to build artifacts for the platform now is [cargo-vita](https://crates.io/crates/cargo-vita) which wraps all the convoluted steps previously described in a yaml for `cargo-make`
- Updated maintainer list for Vita target. (`@ZetaNumbers` `@pheki` please agree to be added to the list, `@amg98` please let us know if you're still planning on actively maintaining target support)

Code changes:
- ~Updated libc for rust-lang/libc#3284 and rust-lang/libc#3366~ (Already merged in rust-lang#116527)
- In dupfd changed the flag same as for esp target, there is no CLOEXEC on Vita
- Enabled `new_pair` since we've implemented `socketpair` in Vita newlib

Author: bors

std/src/os/fd/owned.rs

@@ -97,14 +97,14 @@ impl BorrowedFd<'_> {
         // We want to atomically duplicate this file descriptor and set the
         // CLOEXEC flag, and currently that's done via F_DUPFD_CLOEXEC. This
         // is a POSIX flag that was added to Linux in 2.6.24.
-        #[cfg(not(target_os = "espidf"))]
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
         let cmd = libc::F_DUPFD_CLOEXEC;
 
         // For ESP-IDF, F_DUPFD is used instead, because the CLOEXEC semantics
         // will never be supported, as this is a bare metal framework with
         // no capabilities for multi-process execution. While F_DUPFD is also
         // not supported yet, it might be (currently it returns ENOSYS).
-        #[cfg(target_os = "espidf")]
+        #[cfg(any(target_os = "espidf", target_os = "vita"))]
         let cmd = libc::F_DUPFD;
 
         // Avoid using file descriptors below 3 as they are used for stdio
@@ -119,7 +119,7 @@ impl BorrowedFd<'_> {
     pub fn try_clone_to_owned(&self) -> crate::io::Result<OwnedFd> {
         Err(crate::io::const_io_error!(
             crate::io::ErrorKind::Unsupported,
-            "operation not supported on WASI yet",
+            "operation not supported on this platform",
         ))
     }
 }

std/src/sys/unix/net.rs

@@ -103,7 +103,7 @@ impl Socket {
         }
     }
 
-    #[cfg(not(any(target_os = "vxworks", target_os = "vita")))]
+    #[cfg(not(target_os = "vxworks"))]
     pub fn new_pair(fam: c_int, ty: c_int) -> io::Result<(Socket, Socket)> {
         unsafe {
             let mut fds = [0, 0];
@@ -135,7 +135,7 @@ impl Socket {
         }
     }
 
-    #[cfg(any(target_os = "vxworks", target_os = "vita"))]
+    #[cfg(target_os = "vxworks")]
     pub fn new_pair(_fam: c_int, _ty: c_int) -> io::Result<(Socket, Socket)> {
         unimplemented!()
     }