Define RAND_cleanup in one place only

Change-Id: I439e275394c2ad686924f4e7dfc99cfdc7bb14b9
Reviewed-on: https://boringssl-review.googlesource.com/8682
Reviewed-by: Adam Langley <agl@google.com>

crypto/rand/deterministic.c

diff --git a/crypto/rand/deterministic.c b/crypto/rand/deterministic.c
index e6b7bb7..628fd22 100644
--- a/crypto/rand/deterministic.c
+++ b/crypto/rand/deterministic.c
@@ -30,8 +30,6 @@
  * mutex would not be deterministic.) */
 static uint64_t g_num_calls = 0;
 
-void RAND_cleanup(void) {}
-
 void RAND_reset_for_fuzzing(void) { g_num_calls = 0; }
 
 void CRYPTO_sysrand(uint8_t *out, size_t requested) {

crypto/rand/rand.c

diff --git a/crypto/rand/rand.c b/crypto/rand/rand.c
index 5a1bec2..b73bc3c 100644
--- a/crypto/rand/rand.c
+++ b/crypto/rand/rand.c
@@ -240,3 +240,5 @@
 }
 
 void RAND_set_rand_method(const RAND_METHOD *method) {}
+
+void RAND_cleanup(void) {}

crypto/rand/urandom.c

diff --git a/crypto/rand/urandom.c b/crypto/rand/urandom.c
index 434fe43..4c8a5f7 100644
--- a/crypto/rand/urandom.c
+++ b/crypto/rand/urandom.c
@@ -96,8 +96,6 @@
   urandom_fd = fd;
 }
 
-void RAND_cleanup(void) {}
-
 void RAND_set_urandom_fd(int fd) {
   fd = dup(fd);
   if (fd < 0) {

crypto/rand/windows.c

diff --git a/crypto/rand/windows.c b/crypto/rand/windows.c
index 5a9a96b..de9f4d9 100644
--- a/crypto/rand/windows.c
+++ b/crypto/rand/windows.c
@@ -35,9 +35,6 @@
 #include "internal.h"
 
 
-void RAND_cleanup(void) {
-}
-
 void CRYPTO_sysrand(uint8_t *out, size_t requested) {
   while (requested > 0) {
     ULONG output_bytes_this_pass = ULONG_MAX;