systrace: convert input strings using local codepage.

The message handler uses C strings so no information about encoding is
present. Since an 8 bit encoding is used convert them to make the
systrace window show non-ASCII characters properly.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29206 a1c6a512-1295-4272-9138-f99709370657
diff --git a/rbutil/rbutilqt/systrace.cpp b/rbutil/rbutilqt/systrace.cpp
index 03ba730..5600eb0 100644
--- a/rbutil/rbutilqt/systrace.cpp
+++ b/rbutil/rbutilqt/systrace.cpp
@@ -99,8 +99,7 @@
     if(lastmessage != msg) {
         lastmessage = msg;
         flush();
-        debugbuffer.append(msg);
-        debugbuffer.append("\n");
+        debugbuffer.append(QString::fromLocal8Bit(msg) + "\n");
 #if !defined(NODEBUG)
         fprintf(stderr, "%s\n", msg);
 #endif