In the windows build generator: start storing Windows library dependencies in a python object to allow processing the source/install tree information in a single place instead of in many separate places.
This is the first patch in a serie of windows build generator patches.
* win-tests.py (locate_libs): Use the libraries set for locating bdb
* build/generator/gen_win.py (SVNCommonLibrary): New class (GeneratorBase): Add _libraries variable (_find_bdb): Parse version from header. Create SVNCommonLibrary instance.
(WinGeneratorBase): Produce message using GeneratorBase. (get_win_libs): Look for dependencies in _libraries first. Produce warning for unknown dependencies.