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/foundationdb/patches/fix-scm-version.patch

@@ -0,0 +1,42 @@
+diff --git a/build/scver.mk b/build/scver.mk
+index bdae8be..7539864 100644
+--- a/build/scver.mk
++++ b/build/scver.mk
+@@ -98,33 +98,10 @@ endif
+ GITPRESENT := $(wildcard $(FDBDIR)/.git)
+ HGPRESENT := $(wildcard $(FDBDIR)/.hg)
+ 
+-# Use Git, if not missing
+-ifneq ($(GITPRESENT),)
+-	SCVER := $(shell cd "$(FDBDIR)" && git --version 2>/dev/null)
+-	ifneq ($(SCVER),)
+-		VERSION_ID := $(shell cd "$(FDBDIR)" && git rev-parse --verify HEAD)
+-		SOURCE_CONTROL := GIT
+-		SCBRANCH := $(shell cd "$(FDBDIR)" && git rev-parse --abbrev-ref HEAD)
+-	else
+-$(error Missing git executable on $(PLATFORM) )
+-	endif
+-# Otherwise, use Mercurial
+-else
+-	# Otherwise, use Mercurial, if not missing
+-	ifneq ($(HGPRESENT),)
+-		SCVER := $(shell cd "$(FDBDIR)" && hg --version 2>/dev/null)
+-		ifdef SCVER
+-			VERSION_ID := $(shell cd "$(FDBDIR)" && hg id -n)
+-			SOURCE_CONTROL := MERCURIAL
+-			SCBRANCH := $(shell cd "$(FDBDIR)" && hg branch)
+-		else
+-$(error Missing hg executable on $(PLATFORM))
+-		endif
+-	else
+-	FDBFILES := (shell ls -la $(FDBDIR))
+-$(error Missing source control information for source on $(PLATFORM) in directory: $(FDBDIR) with files: $(FDBFILES))
+-	endif
+-endif
++# NixOS-specific non-VCS packaging, filled out by the nix build
++SOURCE_CONTROL := GIT
++VERSION_ID     := @NIXOS_FDB_VERSION_ID@
++SCBRANCH       := @NIXOS_FDB_SCBRANCH@
+ 
+ # Set the RELEASE variable based on the KVRELEASE variable.
+ ifeq ($(KVRELEASE),1)