EVP constification.

crypto/rc5/rc5ofb64.c

@@ -63,8 +63,9 @@
  * used.  The extra state information to record how much of the
  * 64bit block we have used is contained in *num;
  */
-void RC5_32_ofb64_encrypt(unsigned char *in, unsigned char *out, long length,
-	     RC5_32_KEY *schedule, unsigned char *ivec, int *num)
+void RC5_32_ofb64_encrypt(const unsigned char *in, unsigned char *out,
+			  long length, RC5_32_KEY *schedule,
+			  unsigned char *ivec, int *num)
 	{
 	register unsigned long v0,v1,t;
 	register int n= *num;