Fix linking of the core plugin on Windows.

DestroyIcon needs user32.dll.

Introduced by e0f16c3093 .

Change-Id: I636d1741a6fa7fb7eb35e51a513ad88950f606f6
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Daniel Molkentin <daniel.molkentin@nokia.com>

src/plugins/coreplugin/coreplugin.pro

@@ -216,7 +216,7 @@ RESOURCES += core.qrc \
 win32 {
     SOURCES += progressmanager/progressmanager_win.cpp
     greaterThan(QT_MAJOR_VERSION, 4): QT += gui-private # Uses QPlatformNativeInterface.
-    LIBS += -lole32
+    LIBS += -lole32 -luser32
 }
 else:macx {
     HEADERS += macfullscreen.h

src/plugins/coreplugin/coreplugin.qbs

@@ -30,7 +30,8 @@ QtcPlugin {
 
     cpp.dynamicLibraries: {
         if (qbs.targetOS == "windows") return [
-            "ole32"
+            "ole32",
+            "user32"
         ]
     }