ports/56923: math/grace fails to build

[Fernan Aguero]

Thanks to a suggestion from Lars Köller, upgrading
devel/t1lib solved the build problem for math/grace.

I had t1lib v1.3.x installed while the current version is
5.0.0. 

Looking at the Makefile it seems that the port just checks
for the presence of t1lib. Perhaps it should also check for
some specific version (say t1lib > x.x.x) ?

Just a thought. I guess that the PR can now be closed.

Fernan

-- 
F e r n a n   A g u e r o
http://genoma.unsam.edu.ar/~fernan