ART: Move cmdline parser to header library

Express the cmdline parser as a header library.

TODO: Express the libart dependency correctly.

Test: m
Change-Id: I9e90029d047ab0d75a455a2361d5213a8fa6f361
diff --git a/cmdline/Android.bp b/cmdline/Android.bp
index c811cbd..b46e987 100644
--- a/cmdline/Android.bp
+++ b/cmdline/Android.bp
@@ -14,6 +14,13 @@
 // limitations under the License.
 //
 
+// TODO: this header library depends on libart. Find a way to express that.
+cc_library_headers {
+    name: "art_cmdlineparser_headers",
+    host_supported: true,
+    export_include_dirs: ["."],
+}
+
 art_cc_test {
     name: "art_cmdline_tests",
     defaults: [