This patch fixes the compile error with GNUTLS+NETTLE.
I use following configure options:

./configure --enable-debug --enable-warings --enable-werror
--with-gnutls --without-ssl

In nettle/md5.h, md5_init and md5_update are defined as macros to
nettle_md5_init and nettle_md5_update respectively. This causes
error when using MD5_params.md5_init and md5_update. This patch
renames these members as md5_init_func and md5_update_func to
avoid name conflict. For completeness, MD5_params.md5_final was
also renamed as md5_final_func.

The changes in curl_ntlm_core.c is conversion error and fixed by
casting to proper type.

Best regards,

Tatsuhiro Tsujikawa

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