Const the ex data stuff too to fix warnings

Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>

crypto/ex_data.c

@@ -119,7 +119,7 @@ static void dummy_free(void *parent, void *ptr, CRYPTO_EX_DATA *ad, int idx,
 {
 }
 
-static int dummy_dup(CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from,
+static int dummy_dup(CRYPTO_EX_DATA *to, const CRYPTO_EX_DATA *from,
                      void *from_d, int idx,
                      long argl, void *argp)
 {
@@ -250,7 +250,7 @@ int CRYPTO_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad)
  * for each index in the class used by this variable
  */
 int CRYPTO_dup_ex_data(int class_index, CRYPTO_EX_DATA *to,
-                       CRYPTO_EX_DATA *from)
+                       const CRYPTO_EX_DATA *from)
 {
     int mx, j, i;
     char *ptr;

doc/crypto/CRYPTO_get_ex_new_index.pod

@@ -21,7 +21,7 @@ CRYPTO_get_ex_data, CRYPTO_free_ex_data, CRYPTO_new_ex_data
                            int idx, long argl, void *argp);
  typedef void CRYPTO_EX_free(void *parent, void *ptr, CRYPTO_EX_DATA *ad,
                              int idx, long argl, void *argp);
- typedef int CRYPTO_EX_dup(CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from,
+ typedef int CRYPTO_EX_dup(CRYPTO_EX_DATA *to, const CRYPTO_EX_DATA *from,
                            void *from_d, int idx, long argl, void *argp);
 
  int CRYPTO_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad)

include/openssl/crypto.h

@@ -173,7 +173,7 @@ typedef void CRYPTO_EX_new (void *parent, void *ptr, CRYPTO_EX_DATA *ad,
                            int idx, long argl, void *argp);
 typedef void CRYPTO_EX_free (void *parent, void *ptr, CRYPTO_EX_DATA *ad,
                              int idx, long argl, void *argp);
-typedef int CRYPTO_EX_dup (CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from,
+typedef int CRYPTO_EX_dup (CRYPTO_EX_DATA *to, const CRYPTO_EX_DATA *from,
                            void *srcp, int idx, long argl, void *argp);
 __owur int CRYPTO_get_ex_new_index(int class_index, long argl, void *argp,
                             CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
@@ -187,7 +187,7 @@ int CRYPTO_free_ex_index(int class_index, int idx);
  */
 int CRYPTO_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad);
 int CRYPTO_dup_ex_data(int class_index, CRYPTO_EX_DATA *to,
-                       CRYPTO_EX_DATA *from);
+                       const CRYPTO_EX_DATA *from);
 
 void CRYPTO_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad);