[lmi] Nomenclature for the new md5sum

[Vadim Zeitlin]

 Hello,

 This is a somewhat sophistical question, but is 3rd party md5sum program
still 3rd party if it's compiled from our own sources?

 I'm asking this because of this comment in install_miscellanea.make:

        # The 'md5sum_msw' binary is redistributed to msw end users for
        # authentication, so the 'fardel' target requires it. On other
        # platforms, it cannot be executed directly, but it is needed for
        # creating a cross 'fardel' and for running cross unit tests.
        #
        # It is placed in lmi's 'third_party/bin/' subdirectory--imperatively
        # not in lmi's 'local/bin/' subdirectory, which is added to $PATH.
        # For cygwin builds, the expressly downloaded 'md5sum.exe' is kept off
        # $PATH to prevent it from shadowing cygwin's own version. However,
        # for cross builds, it cannot shadow the native 'md5sum', yet some
        # cross-built unit tests require an msw binary, so add its directory
        # to $WINEPATH to make those tests work (incidentally, 'wine' doesn't
        # find it if it's simply symlinked).

 Does it still make sense to install md5sum.exe we build ourselves into
third_party/bin subdirectory? This seems misleading and I'd rather place it
directly in $bindir, but this would go counter to the imperative above.
OTOH I don't really understand the rationale for avoiding shadowing the
Cygwin binary: why should it matter if both binaries work exactly the same?
Granted, our new one will implement a strict subset of the official
version, but as long as only this subset is used by lmi, it still shouldn't
matter.

 And if it's really important to avoid confusion between the 2 versions,
perhaps it would be better to rename our one to lmi_md5sum.exe or something
else different from the official version?

 Answering this is not urgent but this question would need to be resolved
in some way before we can start using our own md5sum build.

 Thanks in advance,
VZ

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