Add GN Build Files and Custom Modifications

Issue:https://gitee.com/openharmony/build/issues/I6UFTP
Signed-off-by: lubinglun <lubinglun@huawei.com>

BUILD.gn

@@ -0,0 +1,48 @@
+# Copyright (c) 2022 Huawei Device Co., Ltd.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import("//build/ohos.gni")
+
+ohos_cargo_crate("lib") {
+  crate_name = "clang_sys"
+
+  crate_type = "rlib"
+
+  visibility = [ "//third_party/rust/crates/*" ]
+  crate_root = "src/lib.rs"
+
+  sources = [ "src/lib.rs" ]
+  edition = "2015"
+
+  deps = [
+    "//third_party/rust/crates/glob:lib",
+    "//third_party/rust/crates/libc:lib",
+    "//third_party/rust/crates/libloading:lib",
+  ]
+  build_deps = [ "//third_party/rust/crates/glob:lib" ]
+  features = [
+    "clang_3_5",
+    "clang_3_6",
+    "clang_3_7",
+    "clang_3_8",
+    "clang_3_9",
+    "clang_4_0",
+    "clang_5_0",
+    "clang_6_0",
+    "libloading",
+    "static",
+  ]
+  build_root = "build.rs"
+  build_sources = [ "build.rs" ]
+  # deps += [ "//build/rust/clanglibs" ]
+}

build.rs

@@ -62,7 +62,7 @@ fn main() {
 #[cfg(not(feature = "runtime"))]
 fn main() {
     if cfg!(feature = "static") {
-        r#static::link();
+        // r#static::link();
     } else {
         dynamic::link();
     }