[oe] ugly OE issue with RDEPENDS

[Holger Schurig]

> RDEPENDS_classpath-tools = "java2-runtime".

One more comment after reading Koen's reply: maybe you name 
this "virtual/java2-runtime" ?

This has nothing to do with your problem, but just brings in some 
consistency. And maybe, if bitbake ever considers virtual 
packages different when it comes to runtime-dependencies, your 
problem might go away :-)