When doing a custom install and the user selects "Browser Folder", the
folder pickker dialog willl now open up to the selected folder. This will
impact Firefox and Thunderbird.
Add a parameter called DistSubdir which folks writing an installer for the
new toolkit can set in their installer.cfg file. This variable defaults to a
value of bin (so no changes for Firefox here) and you can change it to whatever
directory under dist that you want.
git-svn-id: svn://10.0.0.236/trunk@153932 18797224-902f-48f8-a5cc-f745e15eee43