hg: build-infra/jdk8/jdk: * Convert / as option prefix to - when calling Microsoft tools (msys requirement)

[magnus.ihse.bursie at oracle.com]

Changeset: 68bca5773725
Author:    ihse
Date:      2012-09-24 15:05 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/jdk/rev/68bca5773725

* Convert / as option prefix to - when calling Microsoft tools (msys requirement)

! makefiles/CompileDemos.gmk
! makefiles/CompileLaunchers.gmk
! makefiles/CompileNativeLibraries.gmk