Update ICU to 54.1 step 1

source/data/mappings/windows-950-2000.ucm

Index: source/data/mappings/windows-950-2000.ucm
diff --git a/source/data/mappings/windows-950-2000.ucm b/source/data/mappings/windows-950-2000.ucm
index d09f906f7f9b1fdf9fbcb9adc8e77d6fb6d25cb3..99df8798bf13ad1fc46e590c7a7f8321ebd54ae6 100644
--- a/source/data/mappings/windows-950-2000.ucm
+++ b/source/data/mappings/windows-950-2000.ucm
@@ -32,15 +32,18 @@
 # Suggested ICU specific alias information
 #<icu:alias>                  "windows-950_VPUA"
 
-# CHROME: use the generated state table.
-<icu:state>                  0-80, 81-fe:1, ff
-<icu:state>                  40-7e, a1-fe
+<icu:state>                   0-80, 81-fe:1, ff
+<icu:state>                   40-7e, 80-fe
 
 # build an extension-only (delta) .cnv file
 # requires the base .cnv file at runtime
-# CHROME : we don't want to include ibm-1373
-#<icu:base>                    "ibm-1373_P100-2002"
+<icu:base>                    "ibm-1373_P100-2002"
 
+# The following was the generated state table.
+# This does not account for unassigned characters
+#<icu:state>                  0-80, 81-fe:1, ff
+#<icu:state>                  40-7e, a1-fe
+#
 CHARMAP
 <U0000> \x00 |0
 <U0001> \x01 |0