On the windows-build-update: Add branch readme file and checkpoint current
minimal prototype of the build generator changes.

* BRANCH-README: New.

* gen-make.py: Accept new option --with-deps-package.
   Based on that, select a differend build generator.
   Print a number of warnings related to option usage.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1436512 13f79535-47bb-0310-9956-ffa450edef68