"useless" librt.so.1 dependency on Linux reported by dpkg-shlibdeps

[Baesken, Matthias]

>The safe solution would be to check for a sample of the expected symbols 
>in glibc in configure, but I'm not sure it's worth it. I doubt anyone 
>builds with an older glibc than we do at Oracle, but you never know.


 I was considering this too, but on the other hand it adds complexity only to support some very old setups.
So I was unsure if it is worth it  .

Best regards, Matthias