Use ptr.cast<T>() instead of mem::transmute(ptr).

src/netbsd.rs

@@ -31,7 +31,7 @@ pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
     // getrandom(2) was introduced in NetBSD 10.0
     static GETRANDOM: Weak = unsafe { Weak::new("getrandom\0") };
     if let Some(fptr) = GETRANDOM.ptr() {
-        let func: GetRandomFn = unsafe { core::mem::transmute(fptr) };
+        let func = fptr.cast::<GetRandomFn>().as_ptr();
         return sys_fill_exact(dest, |buf| unsafe {
             func(buf.as_mut_ptr().cast::<u8>(), buf.len(), 0)
         });