poppler: fix select of Qt4 GUI module

For some silly reason, the option is named BR2_PACKAGE_QT_GUI_MODULE
and not BR2_PACKAGE_QT_QUI.

Hopefully fixes:

  http://autobuild.buildroot.org/results/47d/47dee003b29f156496492757cbaa4208b002ab65/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/poppler/Config.in

@@ -15,7 +15,7 @@ if BR2_PACKAGE_POPPLER
 config BR2_PACKAGE_POPPLER_QT
 	bool "Qt support"
 	depends on BR2_PACKAGE_QT
-	select BR2_PACKAGE_QT_GUI
+	select BR2_PACKAGE_QT_GUI_MODULE
 	select BR2_PACKAGE_QT_XML
 	help
 	  Build Qt support into the Poppler library