re: math/cgal and gcc10

[matthew green <mrg%eterna.com.au@localhost>]

> Here (or pkgsrc-users?) seems ok.  But my question would be if cgal
> documents that it needs a C++11 compiler, in which case this change is
> right regardless, or if it's supposed to be ok with C++03, in which case
> maybe something else is wrong.

the release notes from 2017 say that demos require c++11 now
but the library is c++03 itself.

i've tested building with this change on netbsd-9 and in
current with GCC 10, and it seems fine in both.

i'll commit the suggested fix, barring obejctions.

thanks.


.mrg.