testdso.c: library_not_impl

[rb...@apache.org]

This function is currently being mis-used.  On most platforms (most
Unixes, HP, Windows), libraries and modules are identical, on Darwin
they seem to not be equivalent.  For that reason, we have two sets of
tests, one for modules and another for libraries.  Currently on Windows,
we are reporting that the library tests aren't implemented because they
are identical to modules.  The goal for the test suite is to remove as
many Failures and NotImpl results as possible.

To further that goal, we have two options.  1)  Just run the tests twice
(once for modules and once for libraries) even though it is testing the
same thing.  2)  Don't run the tests, but don't report that they weren't
run.  Unix is currently doing option 1.  Windows is doing a third option,
not running them and reporting that they aren't being run.

I would like to come up with a single solution that all platforms follow.
If a platform doesn't have separate libraries and modules, should the
library tests be run or not?

Ryan