Generate the per-arch .map files at build time.

We shouldn't be checking in these generated files...

Bug: N/A
Test: ran tests
Change-Id: Ib67c1ba839eacd7acebd713e1dcd4dd2c25d67f0
diff --git a/tools/Android.bp b/tools/Android.bp
index b44c296..c540c3c 100644
--- a/tools/Android.bp
+++ b/tools/Android.bp
@@ -1 +1,6 @@
 subdirs = ["*"]
+
+filegroup {
+    name: "bionic-generate-version-script",
+    srcs: ["generate-version-script.py"],
+}