[Followup-up to bug 790 ("RFE: Xprt should store the output of the spooler
command in the "xp-spooler-command-results" resource")]
The spooler command output (stdout/stderr) stored in
"xp-spooler-command-results" job attr has the wrong encoding - currently it's
the local encoding used by the Xprint server and not COMPOUND_TEXT as defined in
the Xprint spec.

Currently the code looks this like:
-- snip --
+
+   /* XXX: This should be converted from local multibyte encoding to
+    * Compound Text encoding first */
+   XpPutOneAttribute(pContext, XPJobAttr, "xp-spooler-command-results", buf);
+
-- snip --
|buf| AFAIK needs to be converted to COMPOUND_TEXT first