hg: graal/graal-jvmci-8: Perform a clean in jvmci.make when main clean target is called as well

[doug.simon at oracle.com]

Changeset: 61cc3ee666d2
Author:    Stefan Anzinger <stefan.anzinger at oracle.com>
Date:      2016-01-11 15:10 +0100
URL:       http://hg.openjdk.java.net/graal/graal-jvmci-8/rev/61cc3ee666d2

Perform a clean in jvmci.make when main clean target is called as well

! make/Makefile
! make/defs.make