bitflags升级，配套修改

Signed-off-by: ljy9810 <longjianyin@h-partners.com>

bindgen/codegen/mod.rs

@@ -128,6 +128,7 @@ fn root_import(
 }
 
 bitflags! {
+    #[derive(Copy, Clone)]
     struct DerivableTraits: u16 {
         const DEBUG       = 1 << 0;
         const DEFAULT     = 1 << 1;

bindgen/lib.rs

@@ -107,6 +107,7 @@ fn args_are_cpp(clang_args: &[Box<str>]) -> bool {
 }
 
 bitflags! {
+    #[derive(Copy, Clone, Debug)]
     /// A type used to indicate which kind of items we have to generate.
     pub struct CodegenConfig: u32 {
         /// Whether to generate functions.