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/tools/nix/nixos-option/libnix-copy-paste.cc

@@ -0,0 +1,83 @@
+// These are useful methods inside the nix library that ought to be exported.
+// Since they are not, copy/paste them here.
+// TODO: Delete these and use the ones in the library as they become available.
+
+#include <nix/config.h> // for nix/globals.hh's reference to SYSTEM
+
+#include "libnix-copy-paste.hh"
+#include <boost/format/alt_sstream.hpp>           // for basic_altstringbuf...
+#include <boost/format/alt_sstream_impl.hpp>      // for basic_altstringbuf...
+#include <boost/format/format_class.hpp>          // for basic_format
+#include <boost/format/format_fwd.hpp>            // for format
+#include <boost/format/format_implementation.hpp> // for basic_format::basi...
+#include <boost/optional/optional.hpp>            // for get_pointer
+#include <iostream>                               // for operator<<, basic_...
+#include <nix/types.hh>                           // for Strings, Error
+#include <string>                                 // for string, basic_string
+
+using boost::format;
+using nix::Error;
+using nix::Strings;
+using std::string;
+
+// From nix/src/libexpr/attr-path.cc
+Strings parseAttrPath(const string & s)
+{
+    Strings res;
+    string cur;
+    string::const_iterator i = s.begin();
+    while (i != s.end()) {
+        if (*i == '.') {
+            res.push_back(cur);
+            cur.clear();
+        } else if (*i == '"') {
+            ++i;
+            while (1) {
+                if (i == s.end())
+                    throw Error(format("missing closing quote in selection path '%1%'") % s);
+                if (*i == '"')
+                    break;
+                cur.push_back(*i++);
+            }
+        } else
+            cur.push_back(*i);
+        ++i;
+    }
+    if (!cur.empty())
+        res.push_back(cur);
+    return res;
+}
+
+// From nix/src/nix/repl.cc
+bool isVarName(const string & s)
+{
+    if (s.size() == 0)
+        return false;
+    char c = s[0];
+    if ((c >= '0' && c <= '9') || c == '-' || c == '\'')
+        return false;
+    for (auto & i : s)
+        if (!((i >= 'a' && i <= 'z') || (i >= 'A' && i <= 'Z') || (i >= '0' && i <= '9') || i == '_' || i == '-' ||
+              i == '\''))
+            return false;
+    return true;
+}
+
+// From nix/src/nix/repl.cc
+std::ostream & printStringValue(std::ostream & str, const char * string)
+{
+    str << "\"";
+    for (const char * i = string; *i; i++)
+        if (*i == '\"' || *i == '\\')
+            str << "\\" << *i;
+        else if (*i == '\n')
+            str << "\\n";
+        else if (*i == '\r')
+            str << "\\r";
+        else if (*i == '\t')
+            str << "\\t";
+        else
+            str << *i;
+    str << "\"";
+    return str;
+}