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/servers/mail/postfix/relative-symlinks.patch

@@ -0,0 +1,13 @@
+diff --git a/postfix-install b/postfix/postfix-install
+index 1662c3d..0f20ec0 100644
+--- a/postfix-install
++++ b/postfix-install
+@@ -336,7 +336,7 @@ compare_or_symlink() {
+ 	# 2) we cannot use mv to replace a symlink-to-directory;
+ 	# 3) "ln -n" is not in POSIX, therefore it's not portable.
+ 	# rm+ln is less atomic but this affects compatibility symlinks only.
+-	rm -f $2 && ln -sf $link $2 || exit 1
++	rm -f $2 && ln -rsf $link $2 || exit 1
+     }
+ }
+