Add the rust std as a custom sysroot

library/std/src/sys/pal/survos.rs

@@ -0,0 +1,11 @@
+/// # Safety
+/// `argc` and `argv` are passed by the kernel
+#[unsafe(no_mangle)]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub unsafe extern "C" fn _start(argc: isize, argv: *const *const u8) -> isize {
+    unsafe extern "C" {
+        fn main(argc: isize, argv: *const *const u8) -> isize;
+    }
+
+    unsafe { main(argc, argv) }
+}