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/interpreters/ruby/do-not-regenerate-revision.h.patch

@@ -0,0 +1,23 @@
+Do not regenerate revision.h
+
+Ruby's makefile compares the shipped version with the git revision to regenerate
+revision.h [1], but since we don't include git in buildInputs, this comparison
+fails and it can't find $(REVISION_H).
+
+[1] https://github.com/ruby/ruby/commit/97a5af62a318fcd93a4e5e4428d576c0280ddbae
+
+diff -Naur ruby.old/defs/gmake.mk ruby.new/defs/gmake.mk
+--- ruby.old/defs/gmake.mk
++++ ruby.new/defs/gmake.mk
+@@ -325,11 +325,9 @@
+ 
+ REVISION_IN_HEADER := $(shell sed -n 's/^\#define RUBY_FULL_REVISION "\(.*\)"/\1/p' $(srcdir)/revision.h 2>/dev/null)
+ REVISION_LATEST := $(shell $(CHDIR) $(srcdir) && git log -1 --format=%H 2>/dev/null)
+-ifneq ($(REVISION_IN_HEADER),$(REVISION_LATEST))
+ # GNU make treat the target as unmodified when its dependents get
+ # updated but it is not updated, while others may not.
+ $(srcdir)/revision.h: $(REVISION_H)
+-endif
+ 
+ # Query on the generated rdoc
+ #