Work around Clippy false positive on as c_char

Author: dtolnay

library/std/src/os/raw/mod.rs

@@ -46,6 +46,11 @@ macro_rules! type_alias {
 }
 
 type_alias! { "char.md", c_char = c_char_definition::c_char, NonZero_c_char = c_char_definition::NonZero_c_char;
+// Make this type alias appear cfg-dependent so that Clippy does not suggest
+// replacing `0 as c_char` with `0_i8`/`0_u8`. This #[cfg(all())] can be removed
+// after the false positive in https://github.com/rust-lang/rust-clippy/issues/8093
+// is fixed.
+#[cfg(all())]
 #[doc(cfg(all()))] }
 type_alias! { "schar.md", c_schar = i8, NonZero_c_schar = NonZeroI8; }
 type_alias! { "uchar.md", c_uchar = u8, NonZero_c_uchar = NonZeroU8; }