Initial checkin: feature to control strict IANA encoding name.

git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@174031 13f79535-47bb-0310-9956-ffa450edef68

tools/IANACharset/charset.dtd

+<?xml version="1.0" encoding="USASCII" ?>
+
+<!ELEMENT   Encoding (#PCDATA)>
+<!ATTLIST   Encoding
+            name     CDATA #REQUIRED>
+
+<!ELEMENT   Charset  (Encoding+)>