Rollup merge of #133449 - joboet:io_const_error, r=tgross35

std: expose `const_io_error!` as `const_error!`

ACP: https://github.com/rust-lang/libs-team/issues/205
Tracking issue: https://github.com/rust-lang/rust/issues/133448

Probably best reviewed commit-by-commit, the first one does the API change, the second does the mass-rename.

library/std/src/path.rs

@@ -3581,7 +3581,7 @@ impl Error for StripPrefixError {
 pub fn absolute<P: AsRef<Path>>(path: P) -> io::Result<PathBuf> {
     let path = path.as_ref();
     if path.as_os_str().is_empty() {
-        Err(io::const_io_error!(io::ErrorKind::InvalidInput, "cannot make an empty path absolute",))
+        Err(io::const_error!(io::ErrorKind::InvalidInput, "cannot make an empty path absolute",))
     } else {
         sys::path::absolute(path)
     }