[tlbuild] Problems with parallel make

[Karl Berry]

Hi Ken,

    1. 'make -j13 world' hangs during the 'make install-strip' step, with 
    several 'make' instances still running.  

What are they doing? Can you tell from the processes that are running
when it hangs?

I can't think of what would be different here than in previous years.

    2. 'make -j13 world' produces errors at the 'make check' step in the 
    texk/web2c directory.  This time the build log does show what the 
    problem is:

This at least is clear enough. I think the right thing to do is rename
the tests so they are unique in each subdir. --thanks, karl.