Update ICU to 54.1 step 1

source/data/mappings/windows-1257-html.ucm

Index: source/data/mappings/windows-1257-html.ucm
diff --git a/source/data/mappings/windows-1257-html.ucm b/source/data/mappings/windows-1257-html.ucm
deleted file mode 100644
index fe6c8f0ed0c21a14c4777746f89e065bb05e1360..0000000000000000000000000000000000000000
--- a/source/data/mappings/windows-1257-html.ucm
+++ /dev/null
@@ -1,272 +0,0 @@
-# ***************************************************************************
-# *
-# *   Generated from index-windows-1257.txt (
-# *   https://encoding.spec.whatwg.org/index-windows-1257.txt )
-# *   following the algorithm for the single byte legacy encoding
-# *   described at http://encoding.spec.whatwg.org/#single-byte-decoder
-# *
-# ***************************************************************************
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-<icu:charsetFamily>           "ASCII"
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