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/libraries/ustr/va_args.patch

@@ -0,0 +1,23 @@
+diff --git a/ustr-compiler.h b/ustr-compiler.h
+index 9e71276..c5f847a 100644
+--- a/ustr-compiler.h
++++ b/ustr-compiler.h
+@@ -11,17 +11,11 @@
+ #define USTR_CONF_HAVE_ATTR_FMT 1
+ #endif
+ 
++#include <stdarg.h>
+ /* We assume this is enough,
+  * C99 specifies that va_copy() exists and is a macro */
+-#ifdef va_copy
+ # define USTR_CONF_HAVE_VA_COPY 1
+ # define USTR__VA_COPY(x, y)   va_copy(x, y)
+-#elif __va_copy
+-# define USTR_CONF_HAVE_VA_COPY 1
+-# define USTR__VA_COPY(x, y) __va_copy(x, y)
+-#else
+-# define USTR_CONF_HAVE_VA_COPY 0
+-#endif
+ 
+ #ifndef USTR_CONF_HAVE_ATTR_NONNULL
+ #if defined(__GNUC__) && (__GNUC__ > 3) /* not sure */