Configure creates unnecessary debug/release folders, when source is in put in qt-static-debug folder.

When configuring Qt on Windows.

Keeping the source code in the folder "c:\source\qt-static-debug\4.4.3",
run "configure -debug -static ..." to build Qt in debug mode only,
not release.

When doing this, there will simultaneously be created a folder
"c:\source\qt-static-release\4.4.3", containing some files.

If this is done with a version of Qt built in "c:\source\qt-static-release\4.4.3" before.
Certain files will be overwritten, and the installation stops working.