Add GN Build Files and Custom Modifications

Signed-off-by: peizhe <472708703@qq.com>

README.OpenSource

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+[
+  {
+    "Name": "futures",
+    "License": "Apache License V2.0, MIT",
+    "License File": "LICENSE-APACHE, LICENSE-MIT",
+    "Version Number": "0.3.24",
+    "Owner": "xuelei3@huawei.com",
+    "Upstream URL": "https://github.com/rust-lang/futures-rs",
+    "Description": "An implementation of futures and streams featuring zero allocations, composability, and iterator-like interfaces."
+  }
+]

futures-channel/BUILD.gn

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+# Copyright (c) 2023 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 = "futures_channel"
+  crate_type = "rlib"
+  crate_root = "src/lib.rs"
+
+  sources = [ "src/lib.rs" ]
+  edition = "2018"
+  cargo_pkg_version = "0.3.24"
+  cargo_pkg_name = "futures-channel"
+  deps = [ "//third_party/rust/crates/futures-rs/futures-core:lib" ]
+  features = [
+    "alloc",
+    "default",
+    "std",
+  ]
+}

futures-core/BUILD.gn

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+# Copyright (c) 2023 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 = "futures_core"
+  crate_type = "rlib"
+  crate_root = "src/lib.rs"
+
+  sources = [ "src/lib.rs" ]
+  edition = "2018"
+  cargo_pkg_version = "0.3.24"
+  cargo_pkg_name = "futures-core"
+  features = [
+    "alloc",
+    "default",
+    "std",
+  ]
+}

futures-sink/BUILD.gn

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+# Copyright (c) 2023 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 = "futures_sink"
+  crate_type = "rlib"
+  crate_root = "src/lib.rs"
+
+  sources = [ "src/lib.rs" ]
+  edition = "2018"
+  cargo_pkg_version = "0.3.24"
+  cargo_pkg_name = "futures-sink"
+  features = [
+    "alloc",
+    "default",
+    "std",
+  ]
+}

futures-task/BUILD.gn

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+# Copyright (c) 2023 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 = "futures_task"
+  crate_type = "rlib"
+  crate_root = "src/lib.rs"
+
+  sources = [ "src/lib.rs" ]
+  edition = "2018"
+  cargo_pkg_version = "0.3.24"
+  cargo_pkg_name = "futures-task"
+  features = [
+    "alloc",
+    "default",
+    "std",
+  ]
+}

futures-util/BUILD.gn

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+# Copyright (c) 2023 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 = "futures_util"
+  crate_type = "rlib"
+  crate_root = "src/lib.rs"
+
+  sources = [ "src/lib.rs" ]
+  edition = "2018"
+  cargo_pkg_version = "0.3.24"
+  cargo_pkg_name = "futures-util"
+  deps = [
+    "//third_party/rust/crates/futures-rs/futures-core:lib",
+    "//third_party/rust/crates/futures-rs/futures-task:lib",
+    "//third_party/rust/crates/pin-project-lite:lib",
+    "//third_party/rust/crates/pin-utils:lib",
+  ]
+}