RFR (JDK-7190137) Add support for JVM_VARIANT minimal1

[David Holmes]

webrev: http://cr.openjdk.java.net/~dholmes/7190137/webrev/

This adds support for JVM_VARIANT_MINIMAL1.

Note: due to limitations of the the jvm.cfg file it is not possible to 
build a JDK when only the minimal VM is to be built. This is because the 
default in the jvm.cfg is -client or -server if server class. So if only 
minimal is present then it fails. This causes tool invocations like rmic 
to fail.

This needs to get into jdk8 ASAP.

Thanks,
David