Repair tst_qcoreapplication to not segfault on Android

tst_qcoreapplication.cpp is used both in tst_qcoreapplication and
tst_qguiapplication. To distinguish these two compilations,
the define QT_GUI_LIB was used. This led to an error on Android,
where Qt::Gui is always linked, because the Qt Android Platform
Plugin needs it.
This patch introduces the preprocessor define QT_QGUIAPPLICATIONTEST
which is to be used only in the compilation of tst_qguiapplication.
This is then used instead of QT_GUI_LIB.

Change-Id: Ifa5bfacb197d68365288c1da85573106515fc6c2
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

tests/auto/corelib/kernel/qcoreapplication/tst_qcoreapplication.cpp

@@ -123,7 +123,7 @@ void tst_QCoreApplication::getSetCheck()
 
 void tst_QCoreApplication::qAppName()
 {
-#ifdef QT_GUI_LIB
+#ifdef QT_QGUIAPPLICATIONTEST
     const char* appName = "tst_qguiapplication";
 #else
     const char* appName = "tst_qcoreapplication";
@@ -1078,7 +1078,7 @@ static void createQObjectOnDestruction()
 }
 Q_DESTRUCTOR_FUNCTION(createQObjectOnDestruction)
 
-#ifndef QT_GUI_LIB
+#ifndef QT_QGUIAPPLICATIONTEST
 QTEST_APPLESS_MAIN(tst_QCoreApplication)
 #endif
 

tests/auto/gui/kernel/qguiapplication/CMakeLists.txt

@@ -25,6 +25,7 @@ qt_internal_add_test(tst_qguiapplication
         tst_qguiapplication.cpp
     DEFINES
         QT_DISABLE_DEPRECATED_BEFORE=0x050E00
+        QT_QGUIAPPLICATIONTEST=1
     INCLUDE_DIRECTORIES
         ../../../corelib/kernel/qcoreapplication
     PUBLIC_LIBRARIES