Give every printf-like function restrict qualifiers

The format value has to be a string literal, every time.

Otherwise, you are not using these functions correctly. To reinforce this fact, I putrestrict over every non-contrib example of this I could find.

plugins/sudoers/ldap_util.c

@@ -661,7 +661,7 @@ sudo_ldap_value_len(const char *value)
  * Like strlcat() but escapes characters as per RFC 4515.
  */
 size_t
-sudo_ldap_value_cat(char *dst, const char *src, size_t size)
+sudo_ldap_value_cat(char * restrict dst, const char * restrict src, size_t size)
 {
     char *d = dst;
     const char *s = src;