iOS: Remove deprecated image-based launch screen

Change-Id: I50a7121c55170e1fb6950fdf7bb854cf6699df67
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

mkspecs/features/uikit/default_post.prf

@@ -29,27 +29,13 @@ macx-xcode {
     QMAKE_MAC_XCODE_SETTINGS += device_family
 
     ios {
-        # Set up default 4-inch iPhone/iPod launch image so that our apps
-        # support the full screen resolution of those devices.
-        qmake_launch_image = Default-568h@2x.png
-        qmake_copy_image.input = $$QMAKESPEC/$$qmake_launch_image
-        qmake_copy_image.output = $$OUT_PWD/$${TARGET}.xcodeproj/$$qmake_launch_image
-        qmake_copy_image.CONFIG = verbatim
-        QMAKE_SUBSTITUTES += qmake_copy_image
-        qmake_launch_images.files = $$qmake_copy_image.output
-        QMAKE_BUNDLE_DATA += qmake_launch_images
-
-        !versionAtLeast(QMAKE_XCODE_VERSION, 6.0) {
-            warning("You need to update Xcode to version 6 or newer to fully support iPhone6/6+")
-        } else {
-            # Set up default LaunchScreen to support iPhone6/6+
-            qmake_launch_screen = LaunchScreen.storyboard
-            qmake_copy_launch_screen.input = $$QMAKESPEC/$$qmake_launch_screen
-            qmake_copy_launch_screen.output = $$OUT_PWD/$${TARGET}.xcodeproj/$$qmake_launch_screen
-            QMAKE_SUBSTITUTES += qmake_copy_launch_screen
-            qmake_launch_screens.files = $$qmake_copy_launch_screen.output
-            QMAKE_BUNDLE_DATA += qmake_launch_screens
-        }
+        # Set up default LaunchScreen
+        qmake_launch_screen = LaunchScreen.storyboard
+        qmake_copy_launch_screen.input = $$QMAKESPEC/$$qmake_launch_screen
+        qmake_copy_launch_screen.output = $$OUT_PWD/$${TARGET}.xcodeproj/$$qmake_launch_screen
+        QMAKE_SUBSTITUTES += qmake_copy_launch_screen
+        qmake_launch_screens.files = $$qmake_copy_launch_screen.output
+        QMAKE_BUNDLE_DATA += qmake_launch_screens
     }
 }