Please review changes for JDK-8014762: Add JMC configure option mapping to Jprt.gmk

[Tim Bell]

Hi Klara:

> Need to add the mapping between JPRT env var and configure flag for JMC,
> from ALT_JMC_ZIP_DIR to --with-jmc-zip-dir
> (same pattern as for Javafx)
>
> http://javaweb.us.oracle.com/~klward/webrev/make_jprt_jdk8

This looks fine.

Thanks-

Tim