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/applications/editors/rstudio/clang-location.patch

@@ -0,0 +1,61 @@
+diff --git a/src/cpp/core/libclang/LibClang.cpp b/src/cpp/core/libclang/LibClang.cpp
+index 1186f3a..58e8cc7 100644
+--- a/src/cpp/core/libclang/LibClang.cpp
++++ b/src/cpp/core/libclang/LibClang.cpp
+@@ -58,7 +58,7 @@ std::vector<std::string> defaultCompileArgs(LibraryVersion version)
+ 
+    // we need to add in the associated libclang headers as
+    // they are not discovered / used by default during compilation
+-   FilePath llvmPath = s_libraryPath.getParent().getParent();
++   FilePath llvmPath("@libclang@");
+    boost::format fmt("%1%/lib/clang/%2%/include");
+    fmt % llvmPath.getAbsolutePath() % version.asString();
+    std::string includePath = fmt.str();
+@@ -70,46 +70,7 @@ std::vector<std::string> defaultCompileArgs(LibraryVersion version)
+ 
+ std::vector<std::string> systemClangVersions()
+ {
+-   std::vector<std::string> clangVersions;
+-   
+-#if defined(__APPLE__)
+-   // NOTE: the version of libclang.dylib bundled with Xcode
+-   // doesn't seem to work well when loaded as a library
+-   // (there seems to be extra orchestration required to get
+-   // include paths set up; easier to just depend on command
+-   // line tools since we request their installation in other
+-   // contexts as well)
+-   clangVersions = {
+-      "/Library/Developer/CommandLineTools/usr/lib/libclang.dylib"
+-   };
+-#elif defined(__unix__)
+-   // default set of versions
+-   clangVersions = {
+-      "/usr/lib/libclang.so",
+-      "/usr/lib/llvm/libclang.so",
+-      "/usr/lib64/libclang.so",
+-      "/usr/lib64/llvm/libclang.so",
+-   };
+-   
+-   // iterate through the set of available 'llvm' directories
+-   for (const char* prefix : {"/usr/lib", "/usr/lib64"})
+-   {
+-      FilePath prefixPath(prefix);
+-      if (!prefixPath.exists())
+-         continue;
+-      
+-      std::vector<FilePath> directories;
+-      Error error = prefixPath.getChildren(directories);
+-      if (error)
+-         LOG_ERROR(error);
+-
+-      // generate a path for each 'llvm' directory
+-      for (const FilePath& path : directories)
+-         if (path.getFilename().find("llvm") == 0)
+-            clangVersions.push_back(path.completePath("lib/libclang.so.1").getAbsolutePath());
+-   }
+-#endif
+-   
++   std::vector<std::string> clangVersions = { "@libclang.so@" };
+    return clangVersions;
+ }
+