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/haskell-modules/patches/hunspell.patch

@@ -0,0 +1,30 @@
+diff -Naur hunspell-hs-0.1.0.0.orig/hunspell-hs.cabal hunspell-hs-0.1.0.0/hunspell-hs.cabal
+--- hunspell-hs-0.1.0.0.orig/hunspell-hs.cabal	2018-08-26 20:23:33.053763300 +0200
++++ hunspell-hs-0.1.0.0/hunspell-hs.cabal	2018-08-26 20:42:05.886074510 +0200
+@@ -37,7 +37,7 @@
+       base >=4.7 && <5
+     , stm
+   if os(linux)
+-    extra-libraries:
++    pkgconfig-depends:
+         hunspell
+   if os(darwin)
+     include-dirs:
+@@ -63,7 +63,7 @@
+     , hunspell-hs
+     , stm
+   if os(linux)
+-    extra-libraries:
++    pkgconfig-depends:
+         hunspell
+   if os(darwin)
+     include-dirs:
+@@ -88,7 +88,7 @@
+     , hunspell-hs
+     , stm
+   if os(linux)
+-    extra-libraries:
++    pkgconfig-depends:
+         hunspell
+   if os(darwin)
+     include-dirs: