0012_xopen_crypt_prototype.dpatch by  <dannf@debian.org>

When _XOPEN_SOURCE is defined, the subsequent #include <unistd.h>
will define a correct function prototype for the crypt function.
This avoids segfaults on architectures where the size of a pointer
is greater than the size of an integer (ia64 and amd64 are examples).
This may be detected by looking for build log lines such as the
following:
auth_shadow.c:183: warning: implicit declaration of function ‘crypt’
auth_shadow.c:183: warning: cast to pointer from integer of different
size

diff -urNad trunk~/saslauthd/auth_shadow.c trunk/saslauthd/auth_shadow.c
--- trunk~/saslauthd/auth_shadow.c	2006-05-29 22:52:42.000000000 +0300
+++ trunk/saslauthd/auth_shadow.c	2006-11-08 13:44:23.000000000 +0200
@@ -1,3 +1,4 @@
+#define _XOPEN_SOURCE
 #define PWBUFSZ 256 /***SWB***/
 
 /* MODULE: auth_shadow */