GnuTLS testsuite error on ppc64 after nettle upgrade

Hello,

Upgrading nettle from 3.6 to 3.7 triggers a GnuTLS 3.7.0 testsuite error on both ppc64 and ppc64el:

(sid_ppc64el-dchroot)ametzler@plummer:~/GNUTLS/gnutls28-3.7.0/b4deb/tests$ ./min i-record-2 testing aes-cbc testing aes-cbc-sha256 testing aes-gcm testing aes-ccm testing aes-ccm-8 testing null-sha1 testing arcfour-sha1 testing arcfour-md5 testing chacha20-poly1305 testing tls13-chacha20-poly1305 server:330: client: Error: An unexpected TLS packet was received.

Running the same binary dynamically (with LD_LIBRARY_PATH setting) linked against nettle 3.6 succeeds.

--verbose logs are huge (5-7 MB xz-compressed), I have uploaded them to https://people.debian.org/~ametzler/tmp/

cu Andreas