OSF1 and USE_SIA

[J.S.Peatfield at damtp.cam.ac.uk]

Is the following (from configure.in) intended:

*-dec-osf*)
	if test ! -z "USE_SIA" ; then
		AC_MSG_CHECKING(for Digital Unix Security Integration Architecture)

should that be "$USE_SIA" or similar or what is the point of testing a constant
string for being zero length...

The reason I ask is the for complex reasons we don't want SIA enabled on Tru64
since it breaks some of the local changes we make (well it means we need to
do more work to support SIA which we havn't needed before).