feat: Fix no_std error for last_os_error() when libc is not available e.g. embedded targets

Author: Ilhan Raja

crates/libafl_bolts/src/os.rs

@@ -65,52 +65,6 @@ pub fn last_os_error() -> i32 {
     std::io::Error::last_os_error().raw_os_error().unwrap_or(0)
 }
 
-/// Returns the last OS error (errno).
-///
-/// Currently supported on `no_std`:
-/// * Linux
-/// * Android
-/// * macOS
-/// * FreeBSD
-/// * Dragonfly
-/// * OpenBSD
-/// * NetBSD
-#[must_use]
-#[cfg(all(
-    not(feature = "std"),
-    any(
-        target_os = "linux",
-        target_os = "android",
-        target_os = "macos",
-        target_os = "freebsd",
-        target_os = "dragonfly",
-        target_os = "openbsd",
-        target_os = "netbsd"
-    )
-))]
-pub fn last_os_error() -> i32 {
-    unsafe {
-        #[cfg(target_os = "linux")]
-        {
-            *libc::__errno_location()
-        }
-        #[cfg(target_os = "android")]
-        {
-            *libc::__errno()
-        }
-        #[cfg(any(
-            target_os = "macos",
-            target_os = "freebsd",
-            target_os = "dragonfly",
-            target_os = "openbsd",
-            target_os = "netbsd"
-        ))]
-        {
-            *libc::__error()
-        }
-    }
-}
-
 /// Waits for a pid and returns the status
 #[must_use]
 #[cfg(unix)]