Enable clang::find_bad_constructs for sdk/ (part 1).

This CL removes //build/config/clang:find_bad_constructs from the
suppressed_configs list, which means that clang:find_bad_constructs
is now enabled on these translation units.

Bug: webrtc:9251, webrtc:163
Change-Id: I6f03c46e772ccf4d15951a4b9d4e12015d539e58
Reviewed-on: https://webrtc-review.googlesource.com/90408
Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24113}

sdk/objc/Framework/UnitTests/RTCAudioSessionTest.mm

@@ -299,7 +299,7 @@ namespace webrtc {
 
 class AudioSessionTest : public ::testing::Test {
  protected:
-  void TearDown() {
+  void TearDown() override {
     RTCAudioSession *session = [RTCAudioSession sharedInstance];
     for (id<RTCAudioSessionDelegate> delegate : session.delegates) {
       [session removeDelegate:delegate];