Prefix HAVE_SCTP macro with WEBRTC_.

Generated automatically with:

  git grep -l "\bHAVE_SCTP\b" | xargs \
    sed -i '' 's/HAVE_SCTP/WEBRTC_HAVE_SCTP/g'

Bug: webrtc:11142
Change-Id: I30e16a40ca7a7e388940191df22b705265b42cb4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/202251
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33042}

pc/rtc_stats_integrationtest.cc

@@ -1091,7 +1091,7 @@ class RTCStatsReportVerifier {
   rtc::scoped_refptr<const RTCStatsReport> report_;
 };
 
-#ifdef HAVE_SCTP
+#ifdef WEBRTC_HAVE_SCTP
 TEST_F(RTCStatsIntegrationTest, GetStatsFromCaller) {
   StartCall();
 
@@ -1254,7 +1254,7 @@ TEST_F(RTCStatsIntegrationTest, GetStatsReferencedIds) {
     }
   }
 }
-#endif  // HAVE_SCTP
+#endif  // WEBRTC_HAVE_SCTP
 
 }  // namespace