Changed qprocess unittest to use specific headers instead of QtCore.

Changed qprocess unittest to use specific classes of QtCore instead of
pulling in all of QtCore headers by using include <QtCore>
- Decreasing build time.

Change-Id: Ifc7911548e4a9323726093ac1d35e4ce38b5f8ad
Reviewed-by: Jason McDonald <jason.mcdonald@nokia.com>

tests/auto/corelib/io/qprocess/fileWriterProcess/main.cpp

@@ -38,7 +38,8 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
-#include <QtCore>
+#include <QCoreApplication>
+#include <QFile>
 
 int main(int argc, char **argv)
 {

tests/auto/corelib/io/qprocess/testSetWorkingDirectory/main.cpp

@@ -40,7 +40,9 @@
 ****************************************************************************/
 
 
-#include <QtCore>
+#include <QCoreApplication>
+#include <QByteArray>
+#include <QDir>
 
 int main(int argc, char **argv)
 {