[gnutls-devel] GnuTLS | Mangle/hide GNUTLS-built ecc_scalar_random() (!1300)

[Development of GNU's TLS library]

Daiki Ueno started a new discussion on devel/import-ecc-from-nettle.sh: https://gitlab.com/gnutls/gnutls/-/merge_requests/1300#note_395423261

>  	;;
>        */ecc-random.c )
>  	sed \
> -	  -e 's/"nettle-internal\.h"/"nettle-alloca.h"/' \
> +	  -e 's/"nettle-internal\.h"/"nettle-alloca.h"\nvoid ecc_scalar_random(struct ecc_scalar \*, void \*, nettle_random_func \*);/' \

Using a backslash escape (`\n`) in replacement is not portable, for example:
```console
ueno at gcc-solaris10:~$ echo a > a
ueno at gcc-solaris10:~$ sed 's/a/"bar"\n"foo"/' a
"bar"n"foo"
```
I'd suggest using `i` and `d` combination as in:
https://gitlab.com/gnutls/gnutls/-/blob/master/devel/import-from-nettle.sh#L134

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