Minor style change to improve code style

Minor style change to improve code style

These are small manual changes that are done to improve the code
style and also make the result of uncrustify better without mixing
manual changes/automatic changes into a single commit.

- Make prototype and function identical for gc_addspecial. Also fixes
  uncrustify misparsing the embedded function pointer decleration
- Disallow uncrustify to reformat link_socket_init_phase1, which it
  messes up
- Format the the parameters of a call of  mbedtls_ssl_tls_prf to
  be more inline with the rest of our function calls with multiple
  arguments

Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Antonio Quartulli <antonio@openvpn.net>
Message-Id: <20200416113930.15192-2-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg19748.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>