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/os-specific/linux/ffado/fix-build.patch

@@ -0,0 +1,26 @@
+From b0f2b20b23780dd2e67a01c15462070dd86c4ac1 Mon Sep 17 00:00:00 2001
+From: Jan Tojnar <jtojnar@gmail.com>
+Date: Sun, 3 Mar 2019 11:50:27 +0100
+Subject: [PATCH] Fix build on Nix
+
+We do not have global /usr.
+---
+ SConstruct | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/SConstruct b/SConstruct
+index 05755e4b..3fbdc1d8 100644
+--- a/SConstruct
++++ b/SConstruct
+@@ -537,7 +537,7 @@ env['mandir'] = Template( env.destdir + env['MANDIR'] ).safe_substitute( env )
+ env['pypkgdir'] = Template( env.destdir + env['PYPKGDIR'] ).safe_substitute( env )
+ env['udevdir'] = Template( env.destdir + env['UDEVDIR'] ).safe_substitute( env )
+ env['PYPKGDIR'] = Template( env['PYPKGDIR'] ).safe_substitute( env )
+-env['metainfodir'] = Template( env.destdir + "/usr/share/metainfo" ).safe_substitute( env )
++env['metainfodir'] = Template( env.destdir + env['SHAREDIR'] + "/metainfo" ).safe_substitute( env )
+ 
+ env.Command( target=env['sharedir'], source="", action=Mkdir( env['sharedir'] ) )
+ 
+-- 
+2.19.2
+