set abseil library as secure=false

src/abseil-cpp/gen_build_yaml.py

@@ -26,4 +26,5 @@ for build in builds:
     build['build'] = 'private'
     build['build_system'] = []
     build['language'] = 'c'
+    build['secure'] = False
 print(yaml.dump({'libs': builds}))

templates/Makefile.template

@@ -1493,6 +1493,7 @@
       "language": "c",
       "src": sorted(used_abseil_srcs),
       "hdr": sorted(used_abseil_hdrs),
+      "secure": False,
     })
   %>
   ${makelib(grpc_abseil_lib)}