QPrinter - Make PDF support required for QPrinter

Most of QPrinter assumes that QPdf is available as the fall back engine
in case either the plugin fails to load or there are no real printers
configured. Make this assumption explicit in the feature configure and
remove the two places where QT_NO_PDF is actually checked.

Change-Id: Ibb1bdf3bafa5809fbc844c84d7127911a1685506
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>

src/corelib/global/qfeatures.txt

@@ -748,7 +748,7 @@ Name: QPdf
 Feature: PRINTER
 Description: Supports printing
 Section: Painting
-Requires: PICTURE TEMPORARYFILE
+Requires: PICTURE TEMPORARYFILE PDF
 Name: QPrinter
 
 Feature: CUPS

src/printsupport/kernel/qprinter.cpp

@@ -55,10 +55,7 @@
 
 #include <private/qpagedpaintdevice_p.h>
 
-
-#ifndef QT_NO_PDF
 #include "qprintengine_pdf_p.h"
-#endif
 
 #include <qpicture.h>
 #include <private/qpaintengine_preview_p.h>
@@ -618,8 +615,6 @@ QPrinter::~QPrinter()
 */
 void QPrinter::setOutputFormat(OutputFormat format)
 {
-
-#ifndef QT_NO_PDF
     Q_D(QPrinter);
     if (d->validPrinter && d->outputFormat == format)
         return;
@@ -651,9 +646,6 @@ void QPrinter::setOutputFormat(OutputFormat format)
 
     if (d->outputFormat == QPrinter::PdfFormat)
         d->validPrinter = true;
-#else
-    Q_UNUSED(format);
-#endif
 }
 
 /*!