hw/xwin: Fix compilation of winauth.c with -Werror=implicit-function-declaration

/jhbuild/checkout/xorg/xserver/hw/xwin/winauth.c: In function ‘MitGenerateCookie’:
/jhbuild/checkout/xorg/xserver/hw/xwin/winauth.c:87:5: error: implicit declaration of function ‘MitAddCookie’ [-Werror=implicit-function-declaration]

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Colin Harrison <colin.harrison@virgin.net>
Reviewed-by: Marc Haesen <marha@users.sourceforge.net>

hw/xwin/winauth.c

@@ -36,6 +36,7 @@
 
 /* Includes for authorization */
 #include "securitysrv.h"
+#include "os/osdep.h"
 
 /*
  * Constants
@@ -56,8 +57,7 @@ static char *g_pAuthData = NULL;
  */
 
 #ifndef XCSECURITY
-static
-    void
+void
 GenerateRandomData(int len, char *buf)
 {
     int fd;
@@ -70,9 +70,8 @@ GenerateRandomData(int len, char *buf)
 static char cookie[16];         /* 128 bits */
 
 XID
-    static
 MitGenerateCookie(unsigned data_length,
-                  char *data,
+                  const char *data,
                   XID id, unsigned *data_length_return, char **data_return)
 {
     int i = 0;