adding mmap() and madvise() to fileutils-4.1/src/copy

[Matt]

howdy,
        i have a patch that enables mmap() and madvise() for copying
regular files. i have only tested it on linux. i havent added tests
for HAVE_MADVISE because "i dont know how" (tm). it should probably be
added. also using madvise() on the latest linux kernels (2.4.4-ac9)
seems to trigger a kernel bug and hang your system. hopefully it will
work on other platforms that implement it. currently it is "#if 0"'ed.
anyway the patch is attached.

        matt

fileutils.mmap.diff
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