Update ICU to 54.1 step 1

source/data/mappings/iso-8859-4-html.ucm

Index: source/data/mappings/iso-8859-4-html.ucm
diff --git a/source/data/mappings/iso-8859-4-html.ucm b/source/data/mappings/iso-8859-4-html.ucm
deleted file mode 100644
index ae0721d96c91219db2d2cf67ad282972e79ab083..0000000000000000000000000000000000000000
--- a/source/data/mappings/iso-8859-4-html.ucm
+++ /dev/null
@@ -1,274 +0,0 @@
-# ***************************************************************************
-# *
-# *   Generated from index-iso-8859-4.txt (
-# *   https://encoding.spec.whatwg.org/index-iso-8859-4.txt )
-# *   following the algorithm for the single byte legacy encoding
-# *   described at http://encoding.spec.whatwg.org/#single-byte-decoder
-# *
-# ***************************************************************************
-<code_set_name>               "iso-8859-4-html"
-<char_name_mask>              "AXXXX"
-<mb_cur_max>                  1
-<mb_cur_min>                  1
-<uconv_class>                 "SBCS"
-<subchar>                     \x3F
-<icu:charsetFamily>           "ASCII"
-
-CHARMAP
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-END CHARMAP