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/tools/misc/calamares/nixos-extensions-paths.patch

@@ -0,0 +1,46 @@
+diff --git a/src/calamares/main.cpp b/src/calamares/main.cpp
+index de709156f..a0b6c5faf 100644
+--- a/src/calamares/main.cpp
++++ b/src/calamares/main.cpp
+@@ -131,6 +132,8 @@ main( int argc, char* argv[] )
+     // TODO: umount anything in /tmp/calamares-... as an emergency save function
+ #endif
+ 
++    CalamaresUtils::setNixosDirs();
++
+     bool is_debug = handle_args( a );
+ 
+ #ifdef WITH_KF5DBus
+diff --git a/src/libcalamares/utils/Dirs.cpp b/src/libcalamares/utils/Dirs.cpp
+index f333d6e64..6118fb412 100644
+--- a/src/libcalamares/utils/Dirs.cpp
++++ b/src/libcalamares/utils/Dirs.cpp
+@@ -115,6 +116,14 @@ setXdgDirs()
+     s_haveExtraDirs = !( s_extraConfigDirs.isEmpty() && s_extraDataDirs.isEmpty() );
+ }
+ 
++void
++setNixosDirs()
++{
++    s_extraConfigDirs << "/run/current-system/sw/share/calamares/";
++    s_extraDataDirs << "/run/current-system/sw/share/calamares/";
++    s_haveExtraDirs = !( s_extraConfigDirs.isEmpty() && s_extraDataDirs.isEmpty() ); 
++}
++
+ QStringList
+ extraConfigDirs()
+ {
+diff --git a/src/libcalamares/utils/Dirs.h b/src/libcalamares/utils/Dirs.h
+index 445cbe1f1..da869d446 100644
+--- a/src/libcalamares/utils/Dirs.h
++++ b/src/libcalamares/utils/Dirs.h
+@@ -50,6 +50,9 @@ DLLEXPORT bool isAppDataDirOverridden();
+ /** @brief Setup extra config and data dirs from the XDG variables.
+  */
+ DLLEXPORT void setXdgDirs();
++/** @brief Setup extra config and data dirs fir NixOS.
++ */
++DLLEXPORT void setNixosDirs();
+ /** @brief Are any extra directories configured? */
+ DLLEXPORT bool haveExtraDirs();
+ /** @brief XDG_CONFIG_DIRS, each guaranteed to end with / */