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"

MFC r284289,r288267:

r284289:
Misc fixes from projects/bmake
r288267:
Remove redundant .NOPATH.

MFC r287208, r287216:
Make it buildable with WITH_OPENLDAP, again.

MFC r287208, r287216:
Make it buildable with WITH_OPENLDAP, again.