Do not pass native deps to rlib compilations (#576)

When creating an rlib artifact, rustc will open every
native static library and "copy" its contents into the rlib. This
results in a quadratic disk usage growth and that's not necessary for
rules_rust because we track native dependencies are we can safely pass
them to the final linking actions.

This fixes the build failure when a native dep is actually a linker
script. Rustc will try to open the linker script as if it was a static
archive, and then fail the build.

Creating shared library artifacts (dylib, cdylib) and binaries is not
affected, for those rustc uses the linker, and linker will consume the
linker script just fine. Rustc won't try to open/interpret the linker
script itself.

This also unblocks https://github.com/bazelbuild/rules_rust/pull/562.

rust/rust_common.bzl

diff --git a/rust/rust_common.bzl b/rust/rust_common.bzl
new file mode 100644
index 0000000..d23e513
--- /dev/null
+++ b/rust/rust_common.bzl
@@ -0,0 +1,32 @@
+# Copyright 2015 The Bazel Authors. All rights reserved.
+#
+# 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.
+
+"""Module with Rust definitions required to write custom Rust rules."""
+
+CrateInfo = provider(
+    doc = "A provider containing general Crate information.",
+    fields = {
+        "aliases": "Dict[Label, String]: Renamed and aliased crates",
+        "deps": "List[Provider]: This crate's (rust or cc) dependencies' providers.",
+        "edition": "str: The edition of this crate.",
+        "is_test": "bool: If the crate is being compiled in a test context",
+        "name": "str: The name of this crate.",
+        "output": "File: The output File that will be produced, depends on crate type.",
+        "proc_macro_deps": "List[CrateInfo]: This crate's rust proc_macro dependencies' providers.",
+        "root": "File: The source File entrypoint to this crate, eg. lib.rs",
+        "rustc_env": "Dict[String, String]: Additional `\"key\": \"value\"` environment variables to set for rustc.",
+        "srcs": "List[File]: All source Files that are part of the crate.",
+        "type": "str: The type of this crate. eg. lib or bin",
+    },
+)