Enable -Wexit-time-destructors and -Wglobal-constructors.

This CL enables -Wexit-time-destructors and -Wglobal-constructors on
rtc_static_library and rtc_source_set build targets.

It also adds the possibility to suppress these warnings because
they trigger in a few places.

The long term goal is to avoid regressions on this and remove all the
suppressions.

Bug: webrtc:9693
Change-Id: I4c1ecc137ef9e87ec5e66981ce95d96fb082727c
Reviewed-on: https://webrtc-review.googlesource.com/98380
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24604}
diff --git a/modules/audio_coding/BUILD.gn b/modules/audio_coding/BUILD.gn
index 4d24aff..a08bcf3 100644
--- a/modules/audio_coding/BUILD.gn
+++ b/modules/audio_coding/BUILD.gn
@@ -1156,6 +1156,10 @@
 
 rtc_source_set("neteq_tools") {
   visibility += webrtc_default_visibility
+  configs += [
+    "../..:no_exit_time_destructors",
+    "../..:no_global_constructors",
+  ]
   sources = [
     "neteq/tools/fake_decode_from_file.cc",
     "neteq/tools/fake_decode_from_file.h",