[lmi] Bad md5sum.exe link

[Vadim Zeitlin]

 Hello,

 One minor problem found during the testing of lmi installation (I'll write
another email about the major problem soon) is that the link for md5sum.exe
used in install_miscellanea.make is dead and trying to fetch it from
http://etree.org/cgi-bin/counter.cgi/software/md5sum.exe reliably and
apparently irretrievably results in 404 HTTP error.

 Moreover, http://www.openoffice.org/dev_docs/using_md5sums.html#links
listed as the place to find alternative download links, is itself
unavailable. However looking at the old copies of this page, I see that
it used to point to

http://www.pc-tools.net/files/win32/freeware/md5sums-1.2.zip#!md5!7e67b89a695bfbffc05b7ed2c38f927f

which is still available and so should presumably be used instead.

 However relying on the continued maintenance of these very old files
doesn't seem wise in the long term and I think it would be better to either
copy md5sum.exe to some place from which we could be sure it won't
disappear or maybe compile our own version on the target system instead.

 In any case, I think it would also be better to ignore the error from
md5sum installation and install the other targets from this makefile, as
md5sum is not absolutely required for building lmi itself (but only for
"fardel" target, if I trust the comments in the makefile).

 Regards,
VZ