silvercity: build debugging information on Windows
http://bugs.activestate.com/show_bug.cgi?id=101514

The debugging information is not shipped; it goes into the private symbols
package instead, which is useful for crash reporting / post-mortem
debugging.

(integrated from komodo (trunk) change 83030 by marky)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13975 b87d16e7-d29f-4ee1-b5ec-817d645d335f