Review request 8153217: javafx modules are not included in the jre

[Mandy Chung]

I have yet to understand why the eval doesn’t do its work.  This patch includes 
ReadImportMetaData in make/Images.gmk and 
make/gensrc/GensrcModuleLoaderMap.gmk.  I need to push this fix to unblock 
jdk9/client testing.

http://cr.openjdk.java.net/~mchung/jdk9/webrevs/8153217/webrev.00/

Mandy