krb5: port MIT Linux keyring credentials cache (#166)

include/config.h.w32

@@ -1425,6 +1425,13 @@ static const char *const rcsid[] = { (const char *)rcsid, "@(#)" msg }
 /* Used with login -p */
 /* #undef LOGIN_ARGS */
 
+/* The size of `time_t', as computed by sizeof. */
+#if defined (_USE_64BIT_TIME_T) || !defined( _USE_32BIT_TIME_T)
+#define SIZEOF_TIME_T 8
+#else
+#define SIZEOF_TIME_T 4
+#endif
+
 #ifdef ROKEN_RENAME
 #include "roken_rename.h"
 #endif