8154159: rmic should not have a supported entry point

[Alan Bateman]

When we brought the module system into JDK 9 then it included a new 
entry point for the RMI compiler (rmic). This was a mistake (conflicts 
with the policy for root modules that we have in JEP 261) and should not 
have been brought into JDK 9.  The following patch removes it, it has 
already been removed from the jake forest:

     http://cr.openjdk.java.net/~alanb/8154159/webrev/

Thanks,

Alan