dix: add a new DixAccess bit, "DixPostAccess".

This will be used for follow-up checks after a client has written something,
for security modules that enforce a set of valid values a client can set.

Signed-off-by: Eamon Walsh <ewalsh@tycho.nsa.gov>

include/dixaccess.h

@@ -49,5 +49,6 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define DixManageAccess		(1<<25)	/* manage object */
 #define DixDebugAccess		(1<<26)	/* debug object */
 #define DixBellAccess		(1<<27)	/* audible sound */
+#define DixPostAccess		(1<<28) /* post or follow-up call */
 
 #endif /* DIX_ACCESS_H */