Update ICU to 58.1

source/common/charstr.cpp

Index: source/common/charstr.cpp
diff --git a/source/common/charstr.cpp b/source/common/charstr.cpp
index 1b27c683de2f1809ef786043d11bbdb91c69a959..c792181378ec0b1baad1000f31569e260d5c2f16 100644
--- a/source/common/charstr.cpp
+++ b/source/common/charstr.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) 2010-2015, International Business Machines
@@ -144,7 +146,7 @@ UBool CharString::ensureCapacity(int32_t capacity,
     return TRUE;
 }
 
-CharString &CharString::appendPathPart(const StringPiece &s, UErrorCode &errorCode) {
+CharString &CharString::appendPathPart(StringPiece s, UErrorCode &errorCode) {
     if(U_FAILURE(errorCode)) {
         return *this;
     }