Fix build on Windows with wchar (#47)

diff --git a/src/main/cpp/syslogappender.cpp b/src/main/cpp/syslogappender.cpp
index 65a17fd..18e6478 100644
--- a/src/main/cpp/syslogappender.cpp
+++ b/src/main/cpp/syslogappender.cpp
@@ -337,7 +337,8 @@
 			 it++, current++ ){
 			char buf[12];
 			apr_snprintf( buf, sizeof(buf), "(%d/%d)", current, packets.size() );
-			it->append( buf );
+			LOG4CXX_DECODE_CHAR(str, buf);
+			it->append( str );
 		}
 	}else{
 		packets.push_back( msg );