Make benchmarks compile without QtWidgets

Ensure benchmarks which need QtWidgets are gracefully disabled when
that module is unavailable.

Fixed one unnecessary usage of "QT+=widgets".

Change-Id: I8031b5dca585749f0f4d22e0637adc3f57f4e418
Reviewed-by: Kalle Lehtonen <kalle.ju.lehtonen@nokia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@nokia.com>

tests/benchmarks/corelib/kernel/kernel.pro

@@ -6,3 +6,7 @@ SUBDIRS = \
         qobject \
         qvariant \
         qcoreapplication
+
+isEmpty(QT.widgets.name): SUBDIRS -= \
+    qmetaobject \
+    qobject

tests/benchmarks/gui/animation/animation.pro

@@ -1,2 +1,2 @@
 TEMPLATE = subdirs
-SUBDIRS = qanimation
+!isEmpty(QT.widgets.name):SUBDIRS = qanimation

tests/benchmarks/gui/graphicsview/graphicsview.pro

@@ -7,3 +7,10 @@ SUBDIRS = \
         qgraphicsscene \
         qgraphicsview \
         qgraphicswidget
+
+isEmpty(QT.widgets.name): SUBDIRS -= \
+    qgraphicsanchorlayout \
+    qgraphicsitem \
+    qgraphicsscene \
+    qgraphicsview \
+    qgraphicswidget

tests/benchmarks/gui/gui.pro

@@ -16,3 +16,6 @@ TRUSTED_BENCHMARKS += \
     painting/qtracebench
 
 include(../trusted-benchmarks.pri)
+
+isEmpty(QT.widgets.name): SUBDIRS -= \
+    itemviews

tests/benchmarks/gui/image/image.pro

@@ -5,3 +5,6 @@ SUBDIRS = \
         qimagereader \
         qpixmap \
         qpixmapcache
+
+isEmpty(QT.widgets.name): SUBDIRS -= \
+        qimagereader

tests/benchmarks/gui/kernel/kernel.pro

@@ -1,4 +1,4 @@
 TEMPLATE = subdirs
-SUBDIRS = \
+!isEmpty(QT.widgets.name):SUBDIRS = \
         qapplication \
         qwidget

tests/benchmarks/gui/painting/painting.pro

@@ -5,3 +5,8 @@ SUBDIRS = \
         qtransform \
         qtracebench \
         qtbench
+
+isEmpty(QT.widgets.name): SUBDIRS -= \
+    qpainter \
+    qtracebench \
+    qtbench

tests/benchmarks/gui/styles/styles.pro

@@ -1,3 +1,3 @@
 TEMPLATE = subdirs
-SUBDIRS = \
+!isEmpty(QT.widgets.name):SUBDIRS = \
         qstylesheetstyle

tests/benchmarks/gui/text/qtext/qtext.pro

@@ -1,5 +1,5 @@
-QT += widgets testlib
+QT += testlib
-QT += gui-private widgets-private
+QT += gui-private
 
 TEMPLATE = app
 TARGET = tst_bench_QText