This commit adds support for the three code points in draft-kwiatkowski-tls-ecdhe-mlkem and the code point 0x6399 from draft-tls-westerbaan-xyber768d00. The group 0x6399 uses a pre-standard version of Kyber and is considered obsolete.
The file etc/curves-mapping.txt currently has CRLF line endings and this seems to cause problems with git since .gitattributes now specifies LF line endings for .txt files. This commit changes the line endings for the file in order to (hopefully) prevent problems with git.
