mu-sexp-convert: Fix conversion of elisp times.

Previously, the first element was used where the second should have been.

In essence, whereas the algorithm is T[0]<<16 & T[1], the code was previously performing T[0]<<16 & T[0].

The timestamp produced was therefore inaccurate by up to about 18 hours.

contrib/mu-sexp-convert

@@ -89,7 +89,7 @@ into a list of pairs
 
 (define (etime->time_t t)
   "Convert elisp time object T into a time_t value."
-  (logior (ash (car t) 16) (car t)))
+  (logior (ash (car t) 16) (car (cdr t))))
 
 (define (sexp->xml)
   "Convert string INPUT to XML, return the XML (string)."