mikros: Add the clear_exited syscall

library/std/src/os/mikros/syscalls.rs

@@ -41,3 +41,8 @@ pub fn irq_register(irq: u8) -> Result<(), ()> {
 pub fn wake_new(pid: u64) -> Result<(), ()> {
     syscalls::wake_new(pid)
 }
+
+#[stable(feature = "mikros", since = "1.80.0")]
+pub fn clear_exited(pid: u64) -> Result<(), ()> {
+    syscalls::clear_exited(pid)
+}

library/std/src/sys/pal/mikros/syscalls.rs

@@ -194,3 +194,7 @@ pub fn irq_register(irq: u8) -> Result<(), ()> {
 pub fn wake_new(pid: u64) -> Result<(), ()> {
     if syscall1(24, pid) == 0 { Ok(()) } else { Err(()) }
 }
+
+pub fn clear_exited(pid: u64) -> Result<(), ()> {
+    if syscall1(25, pid) == 0 { Ok(()) } else { Err(()) }
+}