Ports: Remove outdated patch for OpenSSL

Additionally, this patch failed to apply on some versions of `patch`
since it was a git diff instead of a `diff -u` patch.

Ports/openssl/patches/RAND_poll.patch

@@ -1,11 +0,0 @@
-diff --git a/crypto/rand/rand_unix.c b/crypto/rand/rand_unix.c
---- rand_unix.c	2019-09-10 16:24:10.000000000 +0300
-+++ rand_unix_b.c	2020-01-26 15:34:21.226177000 +0300
-@@ -109,6 +109,7 @@
-  *
-  */
- #include <stdio.h>
-+#include <fd_set.h>
- 
- #define USE_SOCKETS
- #include "e_os.h"