(1) Define WRKSRC so it actually works.

(2) The "copy extra file to ${PATCHDIR}" trick doesn't work well if
    ${PATCHDIR} doesn't exist.  Also, you need to delete the patch in
    pre-clean.  In addition, it may give problems to people who are
    trying to build this on a read-only medium.

    Solve all the above problems by calling ${PATCH_CMD} ${PATCH_ARGS}
    directly on the patch in ${FILESDIR}.  Also, make the message a
    little clearer about what's going on.

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