Fix build without feature.label

Change-Id: Ibe4d31d441ff691c4b354dde546e403653564ba4
Reviewed-by: David Faure <david.faure@kdab.com>

src/widgets/kernel/kernel.pri

@@ -23,7 +23,6 @@ HEADERS += \
         kernel/qshortcut.h \
 	kernel/qsizepolicy.h \
         kernel/qstackedlayout.h \
-	kernel/qtooltip.h \
         kernel/qwidget.h \
         kernel/qwidget_p.h \
 	kernel/qwidgetaction.h \
@@ -51,7 +50,6 @@ SOURCES += \
         kernel/qshortcut.cpp \
         kernel/qsizepolicy.cpp \
         kernel/qstackedlayout.cpp \
-	kernel/qtooltip.cpp \
 	kernel/qwidget.cpp \
 	kernel/qwidgetaction.cpp \
 	kernel/qgesture.cpp \
@@ -79,6 +77,11 @@ qtConfig(formlayout) {
     SOURCES += kernel/qformlayout.cpp
 }
 
+qtConfig(tooltip) {
+    HEADERS += kernel/qtooltip.h
+    SOURCES += kernel/qtooltip.cpp
+}
+
 qtConfig(whatsthis) {
     HEADERS += kernel/qwhatsthis.h
     SOURCES += kernel/qwhatsthis.cpp

src/widgets/kernel/qtooltip.cpp

@@ -41,7 +41,6 @@
 #endif
 
 #include <QtWidgets/private/qtwidgetsglobal_p.h>
-#include <QtWidgets/private/qlabel_p.h>
 
 #include <qapplication.h>
 #include <qdesktopwidget.h>
@@ -61,6 +60,7 @@
 
 #ifndef QT_NO_TOOLTIP
 #include <qlabel.h>
+#include <QtWidgets/private/qlabel_p.h>
 #include <qtooltip.h>
 
 #if 0 // Used to be included in Qt4 for Q_WS_MAC