Rollup merge of rust-lang#102227 - devnexen:solarish_get_path, r=m-ou-se

fs::get_path solarish version.

similar to linux, albeit there is no /proc/self notion on solaris
 based system thus flattening the difference for simplification sake.

library/std/src/sys/unix/fs.rs

@@ -1172,7 +1172,12 @@ impl FromRawFd for File {
 
 impl fmt::Debug for File {
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
- #[cfg(any(target_os = "linux", target_os = "netbsd"))]
+ #[cfg(any(
+ target_os = "linux",
+ target_os = "netbsd",
+ target_os = "illumos",
+ target_os = "solaris"
+ ))]
  fn get_path(fd: c_int) -> Option<PathBuf> {
  let mut p = PathBuf::from("/proc/self/fd");
  p.push(&fd.to_string());
@@ -1227,7 +1232,9 @@ impl fmt::Debug for File {
  target_os = "macos",
  target_os = "vxworks",
  all(target_os = "freebsd", target_arch = "x86_64"),
- target_os = "netbsd"
+ target_os = "netbsd",
+ target_os = "illumos",
+ target_os = "solaris"
  )))]
  fn get_path(_fd: c_int) -> Option<PathBuf> {
  // FIXME(#24570): implement this for other Unix platforms