"CONFIG += silent" does not work with mingw

Adding CONFIG += silent to .pro-file causes linking failure.

This issue could be reproduced only on Windows Qt 5.1.1 and CONFIG += silent. On GNU/Linux this issue doesn't appear.

To reproduce this bug one should create simple Qt GUI (widgets) application from QtCreator template and add CONFIG+=silent to project file:

linking release/Untitled.exe
c:/qt/tools/mingw48_32/bin/../lib/gcc/i686-w64-mingw32/4.8.0/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lqtmain
c:/qt/tools/mingw48_32/bin/../lib/gcc/i686-w64-mingw32/4.8.0/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lQt5Widgets
c:/qt/tools/mingw48_32/bin/../lib/gcc/i686-w64-mingw32/4.8.0/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lQt5Gui
c:/qt/tools/mingw48_32/bin/../lib/gcc/i686-w64-mingw32/4.8.0/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lQt5Core