This function will return an intermediate type containing the name
constraints of the provided NameConstraints extension. That can be
used in combination with gnutls_x509_name_constraints_check() to
verify whether a server's name is in accordance with the constraints.
When the flags is set to GNUTLS_NAME_CONSTRAINTS_FLAG_APPEND, then
if the nc type is empty this function will behave identically as if
the flag was not set. Otherwise if there are elements in the nc
structure then the constraints will be merged with the existing
constraints following RFC5280 p6.1.4 (excluded constraints will be
appended, permitted will be intersected).
Note that nc must be initialized prior to calling this function.
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