Fix __ASSUME_PSELECT for MicroBlaze (bug 16642).

Reviewing (for all architectures, with a baseline kernel version of
2.6.32) the kernel support for features for which __ASSUME_* macros
would be affected by a move to 2.6.32 as minimum kernel version showed
up that __ASSUME_PSELECT was wrongly defined for MicroBlaze, despite
the corresponding syscall table entry not being wired up in the
MicroBlaze kernel.

This patch makes the MicroBlaze kernel-features.h undefine
__ASSUME_PSELECT.  I'd also encourage wiring it up in the kernel (so
you can then make this #undef conditional, and eventually obsolete
once a recent-enough kernel is required).  I suspect it wasn't wired
up because of the mistaken comment in asm/unistd.h "obsolete ->
sys_pselect7" (there is no such syscall as pselect7).

	[BZ #16642]
	* sysdeps/unix/sysv/linux/microblaze/kernel-features.h
	(__ASSUME_PSELECT): Undefine.

ChangeLog

@@ -1,3 +1,9 @@
+2014-03-12  Joseph Myers  <joseph@codesourcery.com>
+
+	[BZ #16642]
+	* sysdeps/unix/sysv/linux/microblaze/kernel-features.h
+	(__ASSUME_PSELECT): Undefine.
+
 2014-03-12  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
 
 	[BZ #16689]

NEWS

@@ -10,8 +10,8 @@ Version 2.20
 * The following bugs are resolved with this release:
 
   15347, 15804, 15894, 16447, 16532, 16545, 16574, 16600, 16609, 16610,
-  16611, 16613, 16623, 16632, 16639, 16670, 16674, 16677, 16683, 16689,
-  16695.
+  16611, 16613, 16623, 16632, 16639, 16642, 16670, 16674, 16677, 16683,
+  16689, 16695.
 
 * The am33 port, which had not worked for several years, has been removed
   from ports.

sysdeps/unix/sysv/linux/microblaze/kernel-features.h

@@ -42,3 +42,6 @@
 #endif
 
 #include_next <kernel-features.h>
+
+/* The MicroBlaze kernel does not support the pselect6 syscall.  */
+#undef __ASSUME_PSELECT