MFC r311112,r311115:

r311112:

libgssapi_{krb5,ntlm,spnego} requires MK_GSSAPI != no; conditionalize
their building on the knob

r311115:

Conditionalize adding ${KRB5DIR}/lib/gssapi/krb5/gkrb5_err.et to ETSRCS
if MK_GSSAPI != "no"