uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/applications/science/electronics/caneda/gcc6.patch

@@ -0,0 +1,13 @@
+diff --git c/src/cgraphicsscene.cpp i/src/cgraphicsscene.cpp
+index ac2929a..c399706 100644
+--- c/src/cgraphicsscene.cpp
++++ i/src/cgraphicsscene.cpp
+@@ -1436,7 +1436,7 @@ namespace Caneda
+             QPointF newPos = m_currentWiringWire->mapFromScene(pos);
+             QPointF refPos = m_currentWiringWire->port1()->pos();
+ 
+-            if( abs(refPos.x()-newPos.x()) > abs(refPos.y()-newPos.y()) ) {
++            if( (refPos.x()-newPos.x()) > (refPos.y()-newPos.y()) ) {
+                 m_currentWiringWire->movePort2(QPointF(newPos.x(), refPos.y()));
+             }
+             else {