Update ICU to 58.1

source/common/unicode/uset.h

Index: source/common/unicode/uset.h
diff --git a/source/common/unicode/uset.h b/source/common/unicode/uset.h
index eb3c9e6a06a6f9ff94935ee810e9ca891df60105..8baabbe96b42bac3ee174c95398467d189f4cba0 100644
--- a/source/common/unicode/uset.h
+++ b/source/common/unicode/uset.h
@@ -1,3 +1,5 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
 /*
 *******************************************************************************
 *
@@ -196,11 +198,13 @@ typedef enum USetSpanCondition {
      * @stable ICU 3.8
      */
     USET_SPAN_SIMPLE = 2,
+#ifndef U_HIDE_DEPRECATED_API
     /**
      * One more than the last span condition.
-     * @stable ICU 3.8
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
      */
     USET_SPAN_CONDITION_COUNT
+#endif  // U_HIDE_DEPRECATED_API
 } USetSpanCondition;
 
 enum {