RFR: JDK-8188034 InitSupport does not properly include closed file

[Magnus Ihse Bursie]

After the forest consolidation, InitSupport.gmk does not properly 
include the closed file, since it's not using the normal inclusion 
mechanism (due to the SPEC not being available yet).

Bug: https://bugs.openjdk.java.net/browse/JDK-8188034
Patch inline:
diff --git a/make/InitSupport.gmk b/make/InitSupport.gmk
--- a/make/InitSupport.gmk
+++ b/make/InitSupport.gmk
@@ -36,7 +36,7 @@

    # Include the corresponding closed file, if present.
    # Normal hook mechanism cannot be used since we have no SPEC.
-  -include $(topdir)/closed/make/InitSupport.gmk
+  -include $(topdir)/../closed/make/InitSupport.gmk

##############################################################################
    # Helper functions for the initial part of Init.gmk, before the spec 
file is

/Magnus