hg: build-infra/jdk9/hotspot: * On windows, move -export to mapfile handling. (Assuming these are equal.)

[magnus.ihse.bursie at oracle.com]

Changeset: 321d33b07bb4
Author:    ihse
Date:      2015-11-10 23:22 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/hotspot/rev/321d33b07bb4

* On windows, move -export to mapfile handling. (Assuming these are equal.)
* Add notice on -manifest on windows.

! makefiles/CompileJvm.gmk
! makefiles/JvmPlatforms.gmk
+ makefiles/mapfiles/mapfile-windows