The "GenericResourceDir doesn't point to a valid resource directory"
warning in gs_res.ps doesn't test the correct condition.

The current test only attempts 'status' on
GenericResourceDir (Init) GenericResourcePathSep (gs_init.ps)
which is incorrect if GenericResourceDir is a relative path
as described in Use.htm section 8.1.

For starters, in the case of a relative path, this test ends up
looking for the GenericResourceDir in whatever working directory
ghostscript was started in, rather than appending the relative
path to the search path elements as Use.htm specifies.

Moreover, the whole point of the search path behavior is to allow
multiple Resource trees contributing to the total collection of
resources, and it's to be expected that most of these will *not*
contain Init/gs_init.ps.  Most likely, that's only going to be in
ghostscript's own as-installed Resource tree, probably the last one
on the path.

This test really needs to invoke the same search algorithm normally
used to follow the resource search path, and only complain if it
didn't find Init/gs_init.ps *anywhere*.