[issue4506] 3.0 make test failures on Solaris 10

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

autoconf checks for isinf and isnan fixed in r68299.
I also added a check for isfinite, which should really be used in 
preference to finite:  isfinite is standard in C99, while finite doesn't 
seem to be part of any standard.

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