[Exim] Small patch for src/transports/appendfile.c

The following small patch adds a size suffix to the file name a la
Maildir++. Interestingly, message_size does not seem to include headers.
Is there an easy way to get full message size?

A second patch that recognizes this suffix and uses it to avoid a stat()
would speed up Maildir quota calculation very much.

Michael
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--- appendfile.c.orig    Mon Dec 13 15:51:39 1999
+++ appendfile.c    Mon Dec 13 15:52:44 1999
@@ -1992,8 +1992,8 @@

   for (i = 1;; i++)
     {
-    char *basename = string_sprintf("%lu.%lu.%s%s", time(NULL), getpid(),
-      primary_hostname, tag);
+    char *basename = string_sprintf("%lu.%lu.%s,S=%d%s", time(NULL), getpid(),
+      primary_hostname, message_size, tag);

     filename = dataname = string_sprintf("tmp/%s", basename);
     newname = string_sprintf("new/%s", basename);