[build] Remove global -Wno-deprecated-non-prototype

Fix an instance in libevent.

Sink -Wno-deprecated-non-prototype into zlib, it's the only remaining library where this warning fires. (upstream bug madler/zlib#633)

Bug: 1314867
Change-Id: I2547ba1b358ab90ec6dece4f0879b2ebe6f59820
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3615937
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Arthur Eubanks <aeubanks@google.com>
Cr-Commit-Position: refs/heads/main@{#998593}
NOKEYCHECK=True
GitOrigin-RevId: cbba1d4d16d3dfeb51421749cafa34c2666f8b26

config/compiler/BUILD.gn

@@ -1532,9 +1532,6 @@ config("default_warnings") {
       if (!is_nacl) {
         # TODO(https://crbug.com/1300731) Clean up and enable.
         cflags += [ "-Wno-unqualified-std-cast-call" ]
-
-        # TODO(https://crbug.com/1314867): Clean up and enable.
-        cflags += [ "-Wno-deprecated-non-prototype" ]
       }
 
       if (!is_nacl && !(is_chromeos ||