Merge branch 'tmp-public-header-guards' into 'master'

Add or clean header guards in lib/includes/gnutls/

See merge request gnutls/gnutls!993

diff --cc configure.ac
Simple merge

diff --cc lib/includes/gnutls/abstract.h
Simple merge

diff --cc lib/includes/gnutls/crypto.h
Simple merge

diff --cc lib/includes/gnutls/gnutls.h.in
Simple merge

diff --cc lib/includes/gnutls/ocsp.h
Simple merge

diff --cc lib/includes/gnutls/pkcs7.h
Simple merge

diff --cc lib/includes/gnutls/x509.h
Simple merge