Make ramdisk_available.

Test: pass
Bug: 147347110
Change-Id: I142311a7558a19d209bcd63207a88e12cf6f130e
diff --git a/libc/async_safe/Android.bp b/libc/async_safe/Android.bp
index c28d53a..7df6ab9 100644
--- a/libc/async_safe/Android.bp
+++ b/libc/async_safe/Android.bp
@@ -22,6 +22,7 @@
 
 cc_library_headers {
     name: "libasync_safe_headers",
+    ramdisk_available: true,
     recovery_available: true,
     native_bridge_supported: true,
     defaults: ["linux_bionic_supported"],