Compile toolbox's newfs_msdos for the host

For potential use with build/make/tools/fat16copy.py

Bug: 63035155
Test: mmma system/core/toolbox; newfs_msdos
Change-Id: I8ad50b8c181fc4ec21e191ec9fea8e9aa11d2d9b
diff --git a/toolbox/Android.bp b/toolbox/Android.bp
index a0c2497..077f542 100644
--- a/toolbox/Android.bp
+++ b/toolbox/Android.bp
@@ -61,3 +61,10 @@
     defaults: ["toolbox_defaults"],
     srcs: ["r.c"],
 }
+
+cc_binary_host {
+    name: "newfs_msdos",
+    defaults: ["toolbox_defaults"],
+    srcs: ["newfs_msdos.c"],
+    cflags: ["-Dnewfs_msdos_main=main"]
+}