[tlbuild] asymptote-2.37 in source tree

[Karl Berry]

    Somewhat irritating that you have to set an environmental variable to
    get the right epswrite or successor. No cleverer way to achieve it?

This was John's method of choice.  He did not want the overhead of
invoking an external process on every run to determine it.  If you want
to propose something, submit an issue on his sourceforge ...

    Autowritten config file?

The point was to be able to make the decision at runtime, not
compile-time, because the external gs will vary between systems.  -k