std::rand: adding solaris/illumos for getrandom support.

Author: devnexen

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

@@ -83,6 +83,8 @@ mod imp {
         target_os = "horizon",
         target_os = "freebsd",
         target_os = "dragonfly",
+        target_os = "solaris",
+        target_os = "illumos",
         netbsd10
     )))]
     fn getrandom_fill_bytes(_buf: &mut [u8]) -> bool {
@@ -96,6 +98,8 @@ mod imp {
         target_os = "horizon",
         target_os = "freebsd",
         target_os = "dragonfly",
+        target_os = "solaris",
+        target_os = "illumos",
         netbsd10
     ))]
     fn getrandom_fill_bytes(v: &mut [u8]) -> bool {