The compiler leaks file descriptors in .zip-file land.

The JavaTests Harness uses the compiler is a slightly non-standard
way, but invoking the compiler directly and repeatedly.

Eventually it crashes because it runs out of file descriptors.
Running java under "truss" reveals that the compiler opens
the classes.zip file but never closes it. The result is a steady
leak of file-descriptors.

[Tim, 6/12/96:] Moving owner to dac, as this is almost certainly
a problem in zip code, not the compiler proper.