hg: graal/graal: fixed Windows build issues

[doug.simon at oracle.com]

Changeset: 32434ca987d7
Author:    Doug Simon <doug.simon at oracle.com>
Date:      2015-07-06 00:25 +0200
URL:       http://hg.openjdk.java.net/graal/graal/rev/32434ca987d7

fixed Windows build issues

! mx.graal/mx_graal.py
! mxtool/mx.py
! src/share/vm/jvmci/jvmciCodeInstaller.cpp