lib/curl/Request: "ICY 200 OK" is a response boundary header

NEWS

 ver 0.20.6 (not yet released)
+* input
+  - curl: fix headers after HTTP redirect to Shoutcast server
 * decoder
   - ffmpeg: re-enable as fallback
   - mpcdec: fix crash (division by zero) after seeking

src/lib/curl/Request.cxx

@@ -172,7 +172,10 @@ gcc_pure
 static bool
 IsResponseBoundaryHeader(StringView s)
 {
-	return s.size > 5 && memcmp(s.data, "HTTP/", 5) == 0;
+	return s.size > 5 && (memcmp(s.data, "HTTP/", 5) == 0 ||
+			      /* the proprietary "ICY 200 OK" is
+				 emitted by Shoutcast */
+			      memcmp(s.data, "ICY 2", 5) == 0);
 }
 
 inline void