gn2bp: ignore non-virtual-dtor warning

Eventually, the -W flags should come from target.cflags.

Test: //base:base
Change-Id: I5110ca8007b52b3a9bf96a0f53a96eb12128b052
diff --git a/tools/gn2bp/Android.bp.swp b/tools/gn2bp/Android.bp.swp
index 82c4fba..b33939e 100644
--- a/tools/gn2bp/Android.bp.swp
+++ b/tools/gn2bp/Android.bp.swp
@@ -1729,6 +1729,7 @@
     cflags: [
         "-O2",
         "-Wno-error=return-type",
+        "-Wno-non-virtual-dtor",
         "-Wno-sign-compare",
         "-Wno-sign-promo",
         "-Wno-unused-parameter",