remove deprecated errors. next version will be major.

tinyxml2.cpp

@@ -1977,10 +1977,8 @@ const char* XMLDocument::_errorNames[XML_ERROR_COUNT] = {
     "XML_ERROR_FILE_NOT_FOUND",
     "XML_ERROR_FILE_COULD_NOT_BE_OPENED",
     "XML_ERROR_FILE_READ_ERROR",
-    "UNUSED_XML_ERROR_ELEMENT_MISMATCH",
     "XML_ERROR_PARSING_ELEMENT",
     "XML_ERROR_PARSING_ATTRIBUTE",
-    "UNUSED_XML_ERROR_IDENTIFYING_TAG",
     "XML_ERROR_PARSING_TEXT",
     "XML_ERROR_PARSING_CDATA",
     "XML_ERROR_PARSING_COMMENT",

tinyxml2.h

@@ -525,10 +525,8 @@ enum XMLError {
     XML_ERROR_FILE_NOT_FOUND,
     XML_ERROR_FILE_COULD_NOT_BE_OPENED,
     XML_ERROR_FILE_READ_ERROR,
-    UNUSED_XML_ERROR_ELEMENT_MISMATCH,	// remove at next major version
     XML_ERROR_PARSING_ELEMENT,
     XML_ERROR_PARSING_ATTRIBUTE,
-    UNUSED_XML_ERROR_IDENTIFYING_TAG,	// remove at next major version
     XML_ERROR_PARSING_TEXT,
     XML_ERROR_PARSING_CDATA,
     XML_ERROR_PARSING_COMMENT,