Improve modular Windows building as follows:
1. Output the WebCore debugging symbols (WebCore.pdb) in the same place as the WebCore.lib output library.
2. Teach the WebKit.dll build step where to look for WebCore.pdb.
3. Make sure the Apple internal build includes the WebCore.pdb in its output files.
Created attachment 275895 [details]
Committed r199161: <http://trac.webkit.org/changeset/199161>