hg: build-infra/jdk8/jdk: 2 new changesets

[kelly.ohair at oracle.com]

Changeset: 291857f6d486
Author:    ohair
Date:      2012-08-02 20:26 -0700
URL:       http://hg.openjdk.java.net/build-infra/jdk8/jdk/rev/291857f6d486

Making sure files are deleted before attempts to create them in case they are read-only for some reason.

! makefiles/GensrcJObjC.gmk

Changeset: 6ffbf9dcddca
Author:    ohair
Date:      2012-08-02 22:00 -0700
URL:       http://hg.openjdk.java.net/build-infra/jdk8/jdk/rev/6ffbf9dcddca

backout 291857f6d486

! makefiles/GenerateJavaSources.gmk