remove error string inline. hopefully helps with odd linking issues

tinyxml2.cpp

@@ -2308,6 +2308,16 @@ void XMLDocument::SetError( XMLError error, const char* str1, const char* str2,
     return errorName;
 }
 
+const char* XMLDocument::GetErrorStr1() const 
+{
+	return _errorStr1.GetStr();
+}
+
+const char* XMLDocument::GetErrorStr2() const 
+{
+	return _errorStr2.GetStr();
+}
+
 const char* XMLDocument::ErrorName() const
 {
     return ErrorIDToName(_errorID);

tinyxml2.h

@@ -1803,13 +1803,11 @@ public:
     static const char* ErrorIDToName(XMLError errorID);
 
     /// Return a possibly helpful diagnostic location or string.
-    const char* GetErrorStr1() const {
-        return _errorStr1.GetStr();
-    }
+	const char* GetErrorStr1() const;
+
     /// Return a possibly helpful secondary diagnostic location or string.
-    const char* GetErrorStr2() const {
-        return _errorStr2.GetStr();
-    }
+	const char* GetErrorStr2() const;
+
     /// Return the line where the error occured, or zero if unknown.
     int GetErrorLineNum() const
     {