Update ICU to 58.1

source/i18n/islamcal.cpp

Index: source/i18n/islamcal.cpp
diff --git a/source/i18n/islamcal.cpp b/source/i18n/islamcal.cpp
index 0a9f09726d9eb41c3c64081523c6a74f4084eb91..123b245f2d97e6eaa67efb4ae307d6609ec916e7 100644
--- a/source/i18n/islamcal.cpp
+++ b/source/i18n/islamcal.cpp
@@ -1,3 +1,5 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
 /*
 ******************************************************************************
 * Copyright (C) 2003-2015, International Business Machines Corporation
@@ -734,7 +736,7 @@ int32_t IslamicCalendar::defaultCenturyStartYear() const
 }
 
 
-void U_CALLCONV
+U_CFUNC void U_CALLCONV
 IslamicCalendar::initializeSystemDefaultCentury()
 {
     // initialize systemDefaultCentury and systemDefaultCenturyYear based