the second argument of d2i_X509, d2i_X509_CRL and d2i_X509_REQ is const

PR: 1156
Submitted by: Michael Bell <michael.bell@cms.hu-berlin.de>

doc/crypto/d2i_X509.pod

@@ -9,7 +9,7 @@ i2d_X509_fp - X509 encode and decode functions
 
  #include <openssl/x509.h>
 
- X509 *d2i_X509(X509 **px, unsigned char **in, int len);
+ X509 *d2i_X509(X509 **px, const unsigned char **in, int len);
  int i2d_X509(X509 *x, unsigned char **out);
 
  X509 *d2i_X509_bio(BIO *bp, X509 **x);

doc/crypto/d2i_X509_CRL.pod

@@ -9,7 +9,7 @@ i2d_X509_CRL_bio, i2d_X509_CRL_fp - PKCS#10 certificate request functions.
 
  #include <openssl/x509.h>
 
- X509_CRL *d2i_X509_CRL(X509_CRL **a, unsigned char **pp, long length);
+ X509_CRL *d2i_X509_CRL(X509_CRL **a, const unsigned char **pp, long length);
  int i2d_X509_CRL(X509_CRL *a, unsigned char **pp);
 
  X509_CRL *d2i_X509_CRL_bio(BIO *bp, X509_CRL **x);

doc/crypto/d2i_X509_REQ.pod

@@ -9,7 +9,7 @@ i2d_X509_REQ_bio, i2d_X509_REQ_fp - PKCS#10 certificate request functions.
 
  #include <openssl/x509.h>
 
- X509_REQ *d2i_X509_REQ(X509_REQ **a, unsigned char **pp, long length);
+ X509_REQ *d2i_X509_REQ(X509_REQ **a, const unsigned char **pp, long length);
  int i2d_X509_REQ(X509_REQ *a, unsigned char **pp);
 
  X509_REQ *d2i_X509_REQ_bio(BIO *bp, X509_REQ **x);