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/glibc/rpcgen-path.patch

@@ -0,0 +1,54 @@
+diff -ru glibc-2.18-orig/sunrpc/rpc_main.c glibc-2.18/sunrpc/rpc_main.c
+--- glibc-2.18-orig/sunrpc/rpc_main.c	2013-08-11 00:52:55.000000000 +0200
++++ glibc-2.18/sunrpc/rpc_main.c	2013-11-15 12:04:48.041006977 +0100
+@@ -78,7 +78,7 @@
+ 
+ static const char *svcclosetime = "120";
+ static int cppDefined;	/* explicit path for C preprocessor */
+-static const char *CPP = "/lib/cpp";
++static const char *CPP = "cpp";
+ static const char CPPFLAGS[] = "-C";
+ static char *pathbuf;
+ static int cpp_pid;
+@@ -107,7 +107,6 @@
+ static void open_output (const char *infile, const char *outfile);
+ static void add_warning (void);
+ static void clear_args (void);
+-static void find_cpp (void);
+ static void open_input (const char *infile, const char *define);
+ static int check_nettype (const char *name, const char *list_to_check[]);
+ static void c_output (const char *infile, const char *define,
+@@ -322,25 +321,6 @@
+   argcount = FIXEDARGS;
+ }
+ 
+-/* make sure that a CPP exists */
+-static void
+-find_cpp (void)
+-{
+-  struct stat64 buf;
+-
+-  if (stat64 (CPP, &buf) == 0)
+-    return;
+-
+-  if (cppDefined) /* user specified cpp but it does not exist */
+-    {
+-      fprintf (stderr, _ ("cannot find C preprocessor: %s\n"), CPP);
+-      crash ();
+-    }
+-
+-  /* fall back to system CPP */
+-  CPP = "cpp";
+-}
+-
+ /*
+  * Open input file with given define for C-preprocessor
+  */
+@@ -359,7 +339,6 @@
+   switch (cpp_pid)
+     {
+     case 0:
+-      find_cpp ();
+       putarg (0, CPP);
+       putarg (1, CPPFLAGS);
+       addarg (define);