nettle 4.0 compatibility

Hello,

Nettle-4.0rc1 has been announced recently. It has dropped some legacy
code that is still used by gnutls, e.g. multiple files in
/lib/accelerated have #include <nettle/sha.h> or use SHA1_DATA_SIZE.

Is this already being worked somewhere I did not find or should I open ticket
in the issue-tracker?

cu Andreas
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