Constify d2i, s2i, c2i and r2i functions and other associated

functions and macros.

This change has associated tags: LEVITTE_before_const and
LEVITTE_after_const.  Those will be removed when this change has been
properly reviewed.

crypto/evp/evp_key.c

@@ -66,7 +66,7 @@
 /* should be init to zeros. */
 static char prompt_string[80];
 
-void EVP_set_pw_prompt(char *prompt)
+void EVP_set_pw_prompt(const char *prompt)
 	{
 	if (prompt == NULL)
 		prompt_string[0]='\0';