Update ICU to 54.1 step 1

source/data/mappings/x-mac-cyrillic-html.ucm

Index: source/data/mappings/x-mac-cyrillic-html.ucm
diff --git a/source/data/mappings/x-mac-cyrillic-html.ucm b/source/data/mappings/x-mac-cyrillic-html.ucm
deleted file mode 100644
index 4f935f85f0a058e34069c4831b9d38765c21d16e..0000000000000000000000000000000000000000
--- a/source/data/mappings/x-mac-cyrillic-html.ucm
+++ /dev/null
@@ -1,274 +0,0 @@
-# ***************************************************************************
-# *
-# *   Generated from index-x-mac-cyrillic.txt (
-# *   https://encoding.spec.whatwg.org/index-x-mac-cyrillic.txt )
-# *   following the algorithm for the single byte legacy encoding
-# *   described at http://encoding.spec.whatwg.org/#single-byte-decoder
-# *
-# ***************************************************************************
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-<mb_cur_min>                  1
-<uconv_class>                 "SBCS"
-<subchar>                     \x3F
-<icu:charsetFamily>           "ASCII"
-
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-END CHARMAP