qt5: default to qtquick software backend on big endian

srcpkgs/qt5/patches/0048-big-endian-qtquick-software.patch

@@ -0,0 +1,31 @@
+From 15b3a8fc8635e04fa7ea1275b910772d8f2820a2 Mon Sep 17 00:00:00 2001
+From: q66 <daniel@octaforge.org>
+Date: Sun, 10 May 2020 02:44:47 +0200
+Subject: [PATCH] always default to qtquick software backend on big endian
+
+the default backend is buggy and breaks rendering of various
+components of KDE Plasma and LXQt, so just default to software
+so the user doesn't have to specify QT_QUICK_BACKEND
+---
+ qtdeclarative/src/quick/scenegraph/qsgcontextplugin.cpp | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git qtdeclarative/src/quick/scenegraph/qsgcontextplugin.cpp qtdeclarative/src/quick/scenegraph/qsgcontextplugin.cpp
+index 66add51..a0fdaa2 100644
+--- qtdeclarative/src/quick/scenegraph/qsgcontextplugin.cpp
++++ qtdeclarative/src/quick/scenegraph/qsgcontextplugin.cpp
+@@ -139,7 +139,10 @@ QSGAdaptationBackendData *contextFactory()
+         // If this platform does not support OpenGL, and no backend has been set
+         // default to the software renderer
+         if (requestedBackend.isEmpty()
+-            && !QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::OpenGL)) {
++#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
++            && !QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::OpenGL)
++#endif
++        ) {
+             requestedBackend = QString::fromLocal8Bit("software");
+         }
+ 
+-- 
+2.25.1
+