[empathy] Sync Unix_Timestamp64 definition with the spec

[Guillaume Desmottes <gdesmott src gnome org>]

commit 5056bda77944ccee7a6bc4040a462590c16982b3
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Mon Mar 8 13:15:26 2010 +0100

    Sync Unix_Timestamp64 definition with the spec
    
    It now has the 'x' type.

 extensions/generic-types.xml |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/extensions/generic-types.xml b/extensions/generic-types.xml
index fe27d36..fdab14b 100644
--- a/extensions/generic-types.xml
+++ b/extensions/generic-types.xml
@@ -7,10 +7,10 @@
       (1970-01-01T00:00:00Z)</tp:docstring>
   </tp:simple-type>
 
-  <tp:simple-type name="Unix_Timestamp64" type="t">
-    <tp:docstring>An unsigned 64-bit integer representing time as the number
+  <tp:simple-type name="Unix_Timestamp64" type="x">
+    <tp:docstring>An signed 64-bit integer representing time as the number
       of seconds elapsed since the Unix epoch
-      (1970-01-01T00:00:00Z)</tp:docstring>
+      (1970-01-01T00:00:00Z); negative for times before the epoch</tp:docstring>
 
     <tp:rationale>The Text interface is the only user of Unix_Timestamp so
       far, and we'd like to be Y2038 compatible in future