Add X509_ALGOR_set0_by_nid()

Add X509_ALGOR_set0_by_nid()

X509_ALGOR_set0() is annoyingly unergonomic since it takes an ASN1_OBJECT
rather than a nid.  This means that almost all callers call OBJ_obj2nid()
and they often do this inline without error checking so that the resulting
X509_ALGOR object is corrupted and may lead to incorrect encodings.

Provide an internal alternative X509_ALGOR_set0_by_nid() that takes a nid
instead of an ASN1_OBJECT and performs proper error checking. This will be
used to convert callers of X509_ALGOR_set0() in the library.

ok jsing