std::rand: enable getrandom for dragonflybsd too.

Author: devnexen

library/std/src/sys/pal/unix/rand.rs

@@ -62,7 +62,7 @@ mod imp {
         unsafe { getrandom(buf.as_mut_ptr().cast(), buf.len(), libc::GRND_NONBLOCK) }
     }
 
-    #[cfg(any(target_os = "espidf", target_os = "horizon", target_os = "freebsd", netbsd10))]
+    #[cfg(any(target_os = "espidf", target_os = "horizon", target_os = "freebsd", target_os = "dragonfly", netbsd10))]
     fn getrandom(buf: &mut [u8]) -> libc::ssize_t {
         unsafe { libc::getrandom(buf.as_mut_ptr().cast(), buf.len(), 0) }
     }
@@ -73,6 +73,7 @@ mod imp {
         target_os = "espidf",
         target_os = "horizon",
         target_os = "freebsd",
+        target_os = "dragonfly",
         netbsd10
     )))]
     fn getrandom_fill_bytes(_buf: &mut [u8]) -> bool {
@@ -85,6 +86,7 @@ mod imp {
         target_os = "espidf",
         target_os = "horizon",
         target_os = "freebsd",
+        target_os = "dragonfly",
         netbsd10
     ))]
     fn getrandom_fill_bytes(v: &mut [u8]) -> bool {