hg: jdk/submit: 8196585: Make custom extension point additions

[erik.joelsson at oracle.com]

Changeset: a7ce228abcd7
Author:    erikj
Date:      2018-02-01 09:20 -0800
URL:       http://hg.openjdk.java.net/jdk/submit/rev/a7ce228abcd7

8196585: Make custom extension point additions
Reviewed-by: erikj
Contributed-by: andrew_m_leonard at uk.ibm.com

! make/common/SetupJavaCompilers.gmk
! make/gensrc/GensrcVarHandles.gmk
! make/lib/Lib-java.management.gmk
! make/lib/Lib-jdk.management.gmk