siginfo.h: __SIGEV_PAD_SIZE takes __WORDSIZE into account

Make __SIGEV_PAD_SIZE to take __WORDSIZE into account for alpha, mips
and ia64 arches.

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/sysdeps/linux/alpha/bits/siginfo.h

@@ -257,7 +257,11 @@ enum
 
 /* Structure to transport application-defined values with signals.  */
 # define __SIGEV_MAX_SIZE	64
-# define __SIGEV_PAD_SIZE	((__SIGEV_MAX_SIZE / sizeof (int)) - 4)
+# if __WORDSIZE == 64
+#  define __SIGEV_PAD_SIZE	((__SIGEV_MAX_SIZE / sizeof (int)) - 4)
+# else
+#  define __SIGEV_PAD_SIZE	((__SIGEV_MAX_SIZE / sizeof (int)) - 3)
+# endif
 
 typedef struct sigevent
   {

libc/sysdeps/linux/ia64/bits/siginfo.h

@@ -297,7 +297,11 @@ enum
 
 /* Structure to transport application-defined values with signals.  */
 # define __SIGEV_MAX_SIZE	64
-# define __SIGEV_PAD_SIZE	((__SIGEV_MAX_SIZE / sizeof (int)) - 4)
+# if __WORDSIZE == 64
+#  define __SIGEV_PAD_SIZE	((__SIGEV_MAX_SIZE / sizeof (int)) - 4)
+# else
+#  define __SIGEV_PAD_SIZE	((__SIGEV_MAX_SIZE / sizeof (int)) - 3)
+# endif
 
 typedef struct sigevent
   {

libc/sysdeps/linux/mips/bits/siginfo.h

@@ -264,8 +264,11 @@ enum
 
 /* Structure to transport application-defined values with signals.  */
 # define __SIGEV_MAX_SIZE	64
-# define __SIGEV_HEAD_SIZE	(sizeof(long) + 2*sizeof(int))
-# define __SIGEV_PAD_SIZE	((__SIGEV_MAX_SIZE - __SIGEV_HEAD_SIZE) / sizeof (int))
+# if __WORDSIZE == 64
+#  define __SIGEV_PAD_SIZE	((__SIGEV_MAX_SIZE / sizeof (int)) - 4)
+# else
+#  define __SIGEV_PAD_SIZE	((__SIGEV_MAX_SIZE / sizeof (int)) - 3)
+# endif
 
 /* Forward declaration of the `pthread_attr_t' type.  */
 struct __pthread_attr_s;