Don't implicitly depend on bionic from libunwind_llvm. am: 956ccc2733 am: 8ddc63a1e0

Change-Id: Iecd99393c6a966050f35eaefbd68e0eca37c4ec5
diff --git a/Android.bp b/Android.bp
index 6eb34a0..1ab866a 100644
--- a/Android.bp
+++ b/Android.bp
@@ -61,6 +61,8 @@
     cflags: LIBUNWIND_CFLAGS,
     cppflags: LIBUNWIND_CPPFLAGS,
     stl: "none",
+    system_shared_libs: [],
+    header_libs: ["libc_headers"],
     sanitize: {
         never: true,
     },