Unbundle mdust, blat and bowtie from the package

[mmokrejs]

I am trying to make a package for Gentoo Linux but find it awkward that the make fetches the binaries automagically for me. i have them in /usr/bin/ so no need to fetch some binaries, at all. Not only, Gentoo gatekeepers wouldn't accept such a package.

Would you please change the code in
./blib/lib/RUM/SystemCheck.pm
./blib/lib/RUM/BinDeps.pm
so that the binaries are fetched only if they are not in $PATH? Ideally drop that altogether.

Thanks.