Add SuiteSparse::IsConstrainedApproximateMinimumDegreeOrderingAvailable.

This allows checking for the availability of CAMD without depending
on a preprocessor symbol, which can be the source of subtle bugs
if the file defining that symbol was not included.

Change-Id: I6f1ef91a20baeecf68e8dd467ebe707dde8c5f79
1 file changed