Changes to bionic/libc to demonstrate mixed builds.

Test: source build/envsetup.sh && lunch 16 && source
build/soong/bazel/bazelenv.sh && m, then verify ninja
file was based on intermediates from bazel-out

Change-Id: I89f320dd58083710012ea1f8e3902e723602ea37
diff --git a/libc/tools/BUILD.bazel b/libc/tools/BUILD.bazel
new file mode 100644
index 0000000..469cfab
--- /dev/null
+++ b/libc/tools/BUILD.bazel
@@ -0,0 +1,8 @@
+# This file added for experimental interoperability with Bazel.
+package(default_visibility = ["//visibility:private"])
+
+filegroup(
+    name = "bionic-gensyscalls",
+    srcs = ["gensyscalls.py"],
+    visibility = ["//bionic/libc:__pkg__"],
+)