Patch from Stefan Allius

Patch from Stefan Allius

    the ldd.c wasn't compilable for SuperH due to a missing ELFCLASSM define and
    the readelf executable was linked with a wrong dynamic linker path. To fix
    this I removed the --uclibc-use-build-dir.

    The patch also fixed all the compiler warnings (-Wall -W).

Erik made a few additional changes to eliminate unused function arguments
and fixup a static variable that was was doing the wrong thing