gn2bp: Add flag to fix zlib for compiling on clang

Test: m cronet_aml_third_party_zlib_zlib
Change-Id: I40de0f9b48dd6341753e2013ce75ce02be058479
diff --git a/tools/gn2bp/Android.bp.swp b/tools/gn2bp/Android.bp.swp
index 34a9f49..9386a23 100644
--- a/tools/gn2bp/Android.bp.swp
+++ b/tools/gn2bp/Android.bp.swp
@@ -2334,6 +2334,7 @@
     name: "cronet_aml_defaults",
     cflags: [
         "-O2",
+        "-Wno-deprecated-non-prototype",
         "-Wno-error=return-type",
         "-Wno-macro-redefined",
         "-Wno-missing-field-initializers",