XS RFR: 8016039: jvm.lib is missing from export list unless building server

[David Holmes]

http://cr.openjdk.java.net/~dholmes/8016039/webrev/

Trivial fix just moves the export declaration out of the "server" block 
so that it is always exported.

Pushing to jdk9/hs-rt with a planned backport to 8u

Thanks,
David