ICU update to 54 step 3

source/data/mappings/windows-874-html.ucm

Index: source/data/mappings/windows-874-html.ucm
diff --git a/source/data/mappings/ibm-1162_P100-1999.ucm b/source/data/mappings/windows-874-html.ucm
similarity index 69%
copy from source/data/mappings/ibm-1162_P100-1999.ucm
copy to source/data/mappings/windows-874-html.ucm
index 2e869a665b873dd493b13e0fdcd37b0cf938946b..3a7c02f9b2be41e38471ab1d31c0aad1c887e2f7 100644
--- a/source/data/mappings/ibm-1162_P100-1999.ucm
+++ b/source/data/mappings/windows-874-html.ucm
@@ -1,21 +1,18 @@
 # ***************************************************************************
 # *
-# *   Copyright (C) 1995-2002, International Business Machines
-# *   Corporation and others.  All Rights Reserved.
+# *   Generated from index-windows-874.txt (
+# *   https://encoding.spec.whatwg.org/index-windows-874.txt )
+# *   following the algorithm for the single byte legacy encoding
+# *   described at http://encoding.spec.whatwg.org/#single-byte-decoder
 # *
 # ***************************************************************************
-#
-# File created by rptp2ucm (compiled on Dec  3 2002)
-# from source files 44B0048A.RPMAP100 and 048A44B0.TPMAP100
-#
-<code_set_name>               "ibm-1162_P100-1999"
+<code_set_name>               "windows-874-html"
 <char_name_mask>              "AXXXX"
 <mb_cur_max>                  1
 <mb_cur_min>                  1
 <uconv_class>                 "SBCS"
-<subchar>                     \x1A
+<subchar>                     \x3F
 <icu:charsetFamily>           "ASCII"
-<icu:alias>                   "ibm-1162_STD"
 
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@@ -266,98 +263,4 @@ CHARMAP
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 END CHARMAP