Make things compile with the printer feature disabled

Always include qtprintsupportglobal.h before checking the
ifdef, and add ifdef's where they where missing.

Change-Id: I535dce33b26955fb0196ea05d54be41fe93e9151
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

src/printsupport/dialogs/qprintdialog_unix.cpp

@@ -38,6 +38,7 @@
 ****************************************************************************/
 
 #include "qplatformdefs.h"
+#include <QtPrintSupport/qtprintsupportglobal.h>
 
 #ifndef QT_NO_PRINTDIALOG
 

src/printsupport/dialogs/qprintdialog_win.cpp

@@ -37,6 +37,8 @@
 **
 ****************************************************************************/
 
+#include <QtPrintSupport/qtprintsupportglobal.h>
+
 #ifndef QT_NO_PRINTDIALOG
 
 #include "qprintdialog.h"

src/printsupport/kernel/qpaintengine_alpha.cpp

@@ -37,7 +37,7 @@
 **
 ****************************************************************************/
 
-#include <qglobal.h>
+#include <qtprintsupportglobal.h>
 
 #ifndef QT_NO_PRINTER
 #include <qdebug.h>

src/printsupport/kernel/qplatformprintplugin.cpp

@@ -43,6 +43,8 @@
 #include "private/qfactoryloader_p.h"
 #include <qcoreapplication.h>
 
+#ifndef QT_NO_PRINTER
+
 QT_BEGIN_NAMESPACE
 
 Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader,
@@ -86,3 +88,5 @@ QPlatformPrinterSupport *QPlatformPrinterSupportPlugin::get()
 }
 
 QT_END_NAMESPACE
+
+#endif

src/printsupport/kernel/qplatformprintplugin.h

@@ -53,6 +53,8 @@
 #include <QtCore/qplugin.h>
 #include <QtCore/qfactoryinterface.h>
 
+#ifndef QT_NO_PRINTER
+
 QT_BEGIN_NAMESPACE
 
 
@@ -74,4 +76,6 @@ public:
 
 QT_END_NAMESPACE
 
+#endif
+
 #endif // QPLATFORMPRINTPLUGIN_H

src/printsupport/kernel/qprintengine_win.cpp

@@ -37,6 +37,8 @@
 **
 ****************************************************************************/
 
+#include <QtPrintSupport/qtprintsupportglobal.h>
+
 #ifndef QT_NO_PRINTER
 
 #include "qprintengine_win_p.h"