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/development/libraries/flatpak/unset-env-vars.patch

@@ -0,0 +1,12 @@
+diff --git a/common/flatpak-run.c b/common/flatpak-run.c
+index 146c4f87..bcdad2bc 100644
+--- a/common/flatpak-run.c
++++ b/common/flatpak-run.c
+@@ -1710,6 +1710,7 @@ static const ExportData default_exports[] = {
+   {"GST_PTP_HELPER", NULL},
+   {"GST_PTP_HELPER_1_0", NULL},
+   {"GST_INSTALL_PLUGINS_HELPER", NULL},
++  {"GDK_PIXBUF_MODULE_FILE", NULL},
+ };
+ 
+ static const ExportData no_ld_so_cache_exports[] = {