module: Actually use last component of DT_NEEDED pathname

The comment in module_load() claims that we strip everything from the
DT_NEEDED pathnames but the last component. That's not true as we
leave the initial '/', which works fine if the module is in the root
directory, but not so well if we're in a sub-directory. Worse still,
if the DT_NEEDED entry pathname doesn't include a '/' the module is
skipped entirely.

We should also be loading dependencies in reverse order, as modules
loaded because of DT_NEEDED entries may also have dependencies and
their dependencies should be loaded first.

Also, now we need the strrchr() implementation in the core, so move
strrchr.o into $CORELIBOBJS.

Signed-off-by: Matt Fleming <matt.fleming@intel.com>

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