Use uncompressed point conversion form for 'tls ephemeral' ECC keys

Arаm Sаrgsyаn requested to merge 3087-tls-ephemeral-ecc-gnutls-nss-compat into main

GnuTLS, NSS, and possibly other TLS libraries currently fail to work with compressed point conversion form supported by OpenSSL.

Use uncompressed point conversion form for better compatibility.

Closes #3087 (closed) Related !5627 (merged), #2264 (closed)

Edited by Petr Špaček

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