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/rhvoice/honor_nix_environment.patch

@@ -0,0 +1,31 @@
+diff --git a/SConstruct b/SConstruct
+index 3ad4d9a..fb02365 100644
+--- a/SConstruct
++++ b/SConstruct
+@@ -94,11 +94,8 @@ def CheckWiX(context):
+     return result
+ 
+ def get_spd_module_dir():
+-    env = Environment()
+-    try:
+-        return env.ParseConfig("pkg-config speech-dispatcher --variable=modulebindir", passthru)
+-    except:
+-        return False
++    # cannot write to ${speechd}/libexec/speech-dispatcher-modules
++    return os.path.join(os.environ["out"], "libexec/speech-dispatcher-modules")
+ 
+ def validate_spd_version(key,val,env):
+     m=re.match(r"^\d+\.\d+",val)
+@@ -208,9 +205,9 @@ def create_base_env(user_vars):
+     env_args["package_name"]="RHVoice"
+     env_args["CPPDEFINES"]=[("RHVOICE","1")]
+     env=Environment(**env_args)
+-    if env["dev"]:
+-        env["prefix"]=os.path.abspath("local")
+-        env["RPATH"]=env.Dir("$libdir").abspath
++    env.PrependENVPath("PATH", os.environ["PATH"])
++    env["ENV"]["PKG_CONFIG_PATH"]=os.environ["PKG_CONFIG_PATH"]
++    env["RPATH"]=env.Dir("$libdir").abspath
+     env["package_version"]=get_version(env["release"])
+     env.Append(CPPDEFINES=("PACKAGE",env.subst(r'\"$package_name\"')))
+     if env["PLATFORM"]=="win32":