[gnutls-devel] libtasn1 | Make use of const variant of asn1_node (!9)

[Development of GNU's TLS library]

Tim Rühsen commented on a discussion on lib/coding.c: https://gitlab.com/gnutls/libtasn1/merge_requests/9#note_190297163

>   *   length needed.
>   **/
>  int
> -asn1_der_coding (asn1_node element, const char *name, void *ider, int *len,
> +asn1_der_coding (asn1_node_const element, const char *name, void *ider, int *len,

Example:
```
#include <stdio.h>

typedef const char *char_const;

void func(char_const p)
{
        printf("%s\n", p);
}

void main(void)
{
        const char *p = "hi";
        char buf[16];

        func(p);
        func(buf);
}
```

Both calls to func() are fine.

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