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/audio/zynaddsubfx/mruby-zest/force-gcc-as-linker.patch

@@ -0,0 +1,13 @@
+diff --git a/mruby/tasks/toolchains/gcc.rake b/mruby/tasks/toolchains/gcc.rake
+index f370c0ab..e5ab9f60 100644
+--- a/mruby/tasks/toolchains/gcc.rake
++++ b/mruby/tasks/toolchains/gcc.rake
+@@ -22,7 +22,7 @@ MRuby::Toolchain.new(:gcc) do |conf, _params|
+   end
+ 
+   conf.linker do |linker|
+-    linker.command = ENV['LD'] || 'gcc'
++    linker.command = 'gcc'
+     linker.flags = [ENV['LDFLAGS'] || %w()]
+     linker.libraries = %w(m)
+     linker.library_paths = []