Create a filegroup for versioner dependencies

As part of the build, soong runs the following cmd
```
$ versioner -o <out_dir> bionic/libc/include
bionic/libc/versioner-dependencies
```

To migrate this action to Bazel, create a filegroup module for
`bionic/libc/versioner-dependencies`. In Bazel builds, this target will
be copied to the Bazel's sandbox and placed on the include path when
running versioner. This should be a no-op in Soong.

`bionic/libc/versioner-dependencies` is a collection of symlinks, some of
which point to `prebuilts/clang-tools`. Bazel supports incremental
builds with symlinks out-of-the-box, so we do not need to add special
handling for this directory.

Bug: 301169067
Test: m nothing
Change-Id: I7cbb92e2248c194038a5690c81fed945dee61ccc
diff --git a/libc/Android.bp b/libc/Android.bp
index 68a0838..6b2e2ca 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -3122,3 +3122,10 @@
         },
     },
 }
+
+// headers that will be placed on the include path when running versioner in bazel
+// this module should be a no-op in soong
+filegroup {
+   name: "versioner-dependencies",
+   srcs: ["versioner-dependencies/**/*"],
+}